function check (result)
  if result ~= error_code.eOK then
    error (error_desc [result] or 
           string.format ("Unknown error code: %i", result), 
           2) -- error level - whoever called this function
  end -- if
end -- function check 

const eOK = 0 ' No error
const eWorldOpen = 30001 ' The world is already open
const eWorldClosed = 30002 ' The world is closed, this action cannot be performed
const eNoNameSpecified = 30003 ' No name has been specified where one is required
const eCannotPlaySound = 30004 ' The sound file could not be played
const eTriggerNotFound = 30005 ' The specified trigger name does not exist
const eTriggerAlreadyExists = 30006 ' Attempt to add a trigger that already exists
const eTriggerCannotBeEmpty = 30007 ' The trigger "match" string cannot be empty
const eInvalidObjectLabel = 30008 ' The name of this object is invalid
const eScriptNameNotLocated = 30009 ' Script name is not in the script file
const eAliasNotFound = 30010 ' The specified alias name does not exist
const eAliasAlreadyExists = 30011 ' Attempt to add a alias that already exists
const eAliasCannotBeEmpty = 30012 ' The alias "match" string cannot be empty
const eCouldNotOpenFile = 30013 ' Unable to open requested file
const eLogFileNotOpen = 30014 ' Log file was not open
const eLogFileAlreadyOpen = 30015 ' Log file was already open
const eLogFileBadWrite = 30016 ' Bad write to log file
const eTimerNotFound = 30017 ' The specified timer name does not exist
const eTimerAlreadyExists = 30018 ' Attempt to add a timer that already exists
const eVariableNotFound = 30019 ' Attempt to delete a variable that does not exist
const eCommandNotEmpty = 30020 ' Attempt to use SetCommand with a non-empty command window
const eBadRegularExpression = 30021 ' Bad regular expression syntax
const eTimeInvalid = 30022 ' Time given to AddTimer is invalid
const eBadMapItem = 30023 ' Direction given to AddToMapper is invalid
const eNoMapItems = 30024 ' No items in mapper
const eUnknownOption = 30025 ' Option name not found
const eOptionOutOfRange = 30026 ' New value for option is out of range
const eTriggerSequenceOutOfRange = 30027 ' Trigger sequence value invalid
const eTriggerSendToInvalid = 30028 ' Where to send trigger text to is invalid
const eTriggerLabelNotSpecified = 30029 ' Trigger label not specified/invalid for 'send to variable'
const ePluginFileNotFound = 30030 ' File name specified for plugin not found
const eProblemsLoadingPlugin = 30031 ' There was a parsing or other problem loading the plugin
const ePluginCannotSetOption = 30032 ' Plugin is not allowed to set this option
const ePluginCannotGetOption = 30033 ' Plugin is not allowed to get this option
const eNoSuchPlugin = 30034 ' Requested plugin is not installed
const eNotAPlugin = 30035 ' Only a plugin can do this
const eNoSuchRoutine = 30036 ' Plugin does not support that subroutine (subroutine not in script)
const ePluginDoesNotSaveState = 30037 ' Plugin does not support saving state
const ePluginCouldNotSaveState = 30037 ' Plugin could not save state (eg. no state directory)
const ePluginDisabled = 30039 ' Plugin is currently disabled
const eErrorCallingPluginRoutine = 30040 ' Could not call plugin routine
const eCommandsNestedTooDeeply = 30041 ' Calls to "Execute" nested too deeply
const eCannotCreateChatSocket = 30042 ' Unable to create socket for chat connection
const eCannotLookupDomainName = 30043 ' Unable to do DNS (domain name) lookup for chat connection
const eNoChatConnections = 30044 ' No chat connections open
const eChatPersonNotFound = 30045 ' Requested chat person not connected
const eBadParameter = 30046 ' General problem with a parameter to a script call
const eChatAlreadyListening = 30047 ' Already listening for incoming chats
const eChatIDNotFound = 30048 ' Chat session with that ID not found
const eChatAlreadyConnected = 30049 ' Already connected to that server/port
const eClipboardEmpty = 30050 ' Cannot get (text from the) clipboard
const eFileNotFound = 30051 ' Cannot open the specified file
const eAlreadyTransferringFile = 30052 ' Already transferring a file
const eNotTransferringFile = 30053 ' Not transferring a file
const eNoSuchCommand = 30054 ' There is not a command of that name
const eArrayAlreadyExists = 30055 ' That array already exists
const eBadKeyName = 30056 ' That name is not permitted for a key
const eArrayDoesNotExist = 30056 ' That array does not exist
const eArrayNotEvenNumberOfValues = 30057 ' Values to be imported into array are not in pairs
const eImportedWithDuplicates = 30058 ' Import succeeded, however some values were overwritten
const eBadDelimiter = 30059 ' Import/export delimiter must be a single character, other than backslash
const eSetReplacingExistingValue = 30060 ' Array element set, existing value overwritten
const eKeyDoesNotExist = 30061 ' Array key does not exist
const eCannotImport = 30062 ' Cannot import because cannot find unused temporary character
const eItemInUse = 30063 ' Cannot delete trigger/alias/timer because it is executing a script
const eSpellCheckNotActive = 30064 ' Spell checker is not active

var eOK = 0; // No error
var eWorldOpen = 30001; // The world is already open
var eWorldClosed = 30002; // The world is closed, this action cannot be performed
var eNoNameSpecified = 30003; // No name has been specified where one is required
var eCannotPlaySound = 30004; // The sound file could not be played
var eTriggerNotFound = 30005; // The specified trigger name does not exist
var eTriggerAlreadyExists = 30006; // Attempt to add a trigger that already exists
var eTriggerCannotBeEmpty = 30007; // The trigger "match" string cannot be empty
var eInvalidObjectLabel = 30008; // The name of this object is invalid
var eScriptNameNotLocated = 30009; // Script name is not in the script file
var eAliasNotFound = 30010; // The specified alias name does not exist
var eAliasAlreadyExists = 30011; // Attempt to add a alias that already exists
var eAliasCannotBeEmpty = 30012; // The alias "match" string cannot be empty
var eCouldNotOpenFile = 30013; // Unable to open requested file
var eLogFileNotOpen = 30014; // Log file was not open
var eLogFileAlreadyOpen = 30015; // Log file was already open
var eLogFileBadWrite = 30016; // Bad write to log file
var eTimerNotFound = 30017; // The specified timer name does not exist
var eTimerAlreadyExists = 30018; // Attempt to add a timer that already exists
var eVariableNotFound = 30019; // Attempt to delete a variable that does not exist
var eCommandNotEmpty = 30020; // Attempt to use SetCommand with a non-empty command window
var eBadRegularExpression = 30021; // Bad regular expression syntax
var eTimeInvalid = 30022; // Time given to AddTimer is invalid
var eBadMapItem = 30023; // Direction given to AddToMapper is invalid
var eNoMapItems = 30024; // No items in mapper
var eUnknownOption = 30025; // Option name not found
var eOptionOutOfRange = 30026; // New value for option is out of range
var eTriggerSequenceOutOfRange = 30027; // Trigger sequence value invalid
var eTriggerSendToInvalid = 30028; // Where to send trigger text to is invalid
var eTriggerLabelNotSpecified = 30029; // Trigger label not specified/invalid for 'send to variable'
var ePluginFileNotFound = 30030; // File name specified for plugin not found
var eProblemsLoadingPlugin = 30031; // There was a parsing or other problem loading the plugin
var ePluginCannotSetOption = 30032; // Plugin is not allowed to set this option
var ePluginCannotGetOption = 30033; // Plugin is not allowed to get this option
var eNoSuchPlugin = 30034; // Requested plugin is not installed
var eNotAPlugin = 30035; // Only a plugin can do this
var eNoSuchRoutine = 30036; // Plugin does not support that subroutine (subroutine not in script)
var ePluginDoesNotSaveState = 30037; // Plugin does not support saving state
var ePluginCouldNotSaveState = 30037; // Plugin could not save state (eg. no state directory)
var ePluginDisabled = 30039; // Plugin is currently disabled
var eErrorCallingPluginRoutine = 30040; // Could not call plugin routine
var eCommandsNestedTooDeeply = 30041; // Calls to "Execute" nested too deeply
var eCannotCreateChatSocket = 30042; // Unable to create socket for chat connection
var eCannotLookupDomainName = 30043; // Unable to do DNS (domain name) lookup for chat connection
var eNoChatConnections = 30044; // No chat connections open
var eChatPersonNotFound = 30045; // Requested chat person not connected
var eBadParameter = 30046; // General problem with a parameter to a script call
var eChatAlreadyListening = 30047; // Already listening for incoming chats
var eChatIDNotFound = 30048; // Chat session with that ID not found
var eChatAlreadyConnected = 30049; // Already connected to that server/port
var eClipboardEmpty = 30050; // Cannot get (text from the) clipboard
var eFileNotFound = 30051; // Cannot open the specified file
var eAlreadyTransferringFile = 30052; // Already transferring a file
var eNotTransferringFile = 30053; // Not transferring a file
var eNoSuchCommand = 30054; // There is not a command of that name
var eArrayAlreadyExists = 30055; // That array already exists
var eBadKeyName = 30056; // That name is not permitted for a key
var eArrayDoesNotExist = 30056; // That array does not exist
var eArrayNotEvenNumberOfValues = 30057; // Values to be imported into array are not in pairs
var eImportedWithDuplicates = 30058; // Import succeeded, however some values were overwritten
var eBadDelimiter = 30059; // Import/export delimiter must be a single character, other than backslash
var eSetReplacingExistingValue = 30060; // Array element set, existing value overwritten
var eKeyDoesNotExist = 30061; // Array key does not exist
var eCannotImport = 30062; // Cannot import because cannot find unused temporary character
var eItemInUse = 30063; // Cannot delete trigger/alias/timer because it is executing a script
var eSpellCheckNotActive = 30064; // Spell checker is not active

my $eOK = 0; # No error
my $eWorldOpen = 30001; # The world is already open
my $eWorldClosed = 30002; # The world is closed, this action cannot be performed
my $eNoNameSpecified = 30003; # No name has been specified where one is required
my $eCannotPlaySound = 30004; # The sound file could not be played
my $eTriggerNotFound = 30005; # The specified trigger name does not exist
my $eTriggerAlreadyExists = 30006; # Attempt to add a trigger that already exists
my $eTriggerCannotBeEmpty = 30007; # The trigger "match" string cannot be empty
my $eInvalidObjectLabel = 30008; # The name of this object is invalid
my $eScriptNameNotLocated = 30009; # Script name is not in the script file
my $eAliasNotFound = 30010; # The specified alias name does not exist
my $eAliasAlreadyExists = 30011; # Attempt to add a alias that already exists
my $eAliasCannotBeEmpty = 30012; # The alias "match" string cannot be empty
my $eCouldNotOpenFile = 30013; # Unable to open requested file
my $eLogFileNotOpen = 30014; # Log file was not open
my $eLogFileAlreadyOpen = 30015; # Log file was already open
my $eLogFileBadWrite = 30016; # Bad write to log file
my $eTimerNotFound = 30017; # The specified timer name does not exist
my $eTimerAlreadyExists = 30018; # Attempt to add a timer that already exists
my $eVariableNotFound = 30019; # Attempt to delete a variable that does not exist
my $eCommandNotEmpty = 30020; # Attempt to use SetCommand with a non-empty command window
my $eBadRegularExpression = 30021; # Bad regular expression syntax
my $eTimeInvalid = 30022; # Time given to AddTimer is invalid
my $eBadMapItem = 30023; # Direction given to AddToMapper is invalid
my $eNoMapItems = 30024; # No items in mapper
my $eUnknownOption = 30025; # Option name not found
my $eOptionOutOfRange = 30026; # New value for option is out of range
my $eTriggerSequenceOutOfRange = 30027; # Trigger sequence value invalid
my $eTriggerSendToInvalid = 30028; # Where to send trigger text to is invalid
my $eTriggerLabelNotSpecified = 30029; # Trigger label not specified/invalid for 'send to variable'
my $ePluginFileNotFound = 30030; # File name specified for plugin not found
my $eProblemsLoadingPlugin = 30031; # There was a parsing or other problem loading the plugin
my $ePluginCannotSetOption = 30032; # Plugin is not allowed to set this option
my $ePluginCannotGetOption = 30033; # Plugin is not allowed to get this option
my $eNoSuchPlugin = 30034; # Requested plugin is not installed
my $eNotAPlugin = 30035; # Only a plugin can do this
my $eNoSuchRoutine = 30036; # Plugin does not support that subroutine (subroutine not in script)
my $ePluginDoesNotSaveState = 30037; # Plugin does not support saving state
my $ePluginCouldNotSaveState = 30037; # Plugin could not save state (eg. no state directory)
my $ePluginDisabled = 30039; # Plugin is currently disabled
my $eErrorCallingPluginRoutine = 30040; # Could not call plugin routine
my $eCommandsNestedTooDeeply = 30041; # Calls to "Execute" nested too deeply
my $eCannotCreateChatSocket = 30042; # Unable to create socket for chat connection
my $eCannotLookupDomainName = 30043; # Unable to do DNS (domain name) lookup for chat connection
my $eNoChatConnections = 30044; # No chat connections open
my $eChatPersonNotFound = 30045; # Requested chat person not connected
my $eBadParameter = 30046; # General problem with a parameter to a script call
my $eChatAlreadyListening = 30047; # Already listening for incoming chats
my $eChatIDNotFound = 30048; # Chat session with that ID not found
my $eChatAlreadyConnected = 30049; # Already connected to that server/port
my $eClipboardEmpty = 30050; # Cannot get (text from the) clipboard
my $eFileNotFound = 30051; # Cannot open the specified file
my $eAlreadyTransferringFile = 30052; # Already transferring a file
my $eNotTransferringFile = 30053; # Not transferring a file
my $eNoSuchCommand = 30054; # There is not a command of that name
my $eArrayAlreadyExists = 30055; # That array already exists
my $eBadKeyName = 30056; # That name is not permitted for a key
my $eArrayDoesNotExist = 30056; # That array does not exist
my $eArrayNotEvenNumberOfValues = 30057; # Values to be imported into array are not in pairs
my $eImportedWithDuplicates = 30058; # Import succeeded, however some values were overwritten
my $eBadDelimiter = 30059; # Import/export delimiter must be a single character, other than backslash
my $eSetReplacingExistingValue = 30060; # Array element set, existing value overwritten
my $eKeyDoesNotExist = 30061; # Array key does not exist
my $eCannotImport = 30062; # Cannot import because cannot find unused temporary character
my $eItemInUse = 30063; # Cannot delete trigger/alias/timer because it is executing a script
my $eSpellCheckNotActive = 30064; # Spell checker is not active

eOK = 0 # No error
eWorldOpen = 30001 # The world is already open
eWorldClosed = 30002 # The world is closed, this action cannot be performed
eNoNameSpecified = 30003 # No name has been specified where one is required
eCannotPlaySound = 30004 # The sound file could not be played
eTriggerNotFound = 30005 # The specified trigger name does not exist
eTriggerAlreadyExists = 30006 # Attempt to add a trigger that already exists
eTriggerCannotBeEmpty = 30007 # The trigger "match" string cannot be empty
eInvalidObjectLabel = 30008 # The name of this object is invalid
eScriptNameNotLocated = 30009 # Script name is not in the script file
eAliasNotFound = 30010 # The specified alias name does not exist
eAliasAlreadyExists = 30011 # Attempt to add a alias that already exists
eAliasCannotBeEmpty = 30012 # The alias "match" string cannot be empty
eCouldNotOpenFile = 30013 # Unable to open requested file
eLogFileNotOpen = 30014 # Log file was not open
eLogFileAlreadyOpen = 30015 # Log file was already open
eLogFileBadWrite = 30016 # Bad write to log file
eTimerNotFound = 30017 # The specified timer name does not exist
eTimerAlreadyExists = 30018 # Attempt to add a timer that already exists
eVariableNotFound = 30019 # Attempt to delete a variable that does not exist
eCommandNotEmpty = 30020 # Attempt to use SetCommand with a non-empty command window
eBadRegularExpression = 30021 # Bad regular expression syntax
eTimeInvalid = 30022 # Time given to AddTimer is invalid
eBadMapItem = 30023 # Direction given to AddToMapper is invalid
eNoMapItems = 30024 # No items in mapper
eUnknownOption = 30025 # Option name not found
eOptionOutOfRange = 30026 # New value for option is out of range
eTriggerSequenceOutOfRange = 30027 # Trigger sequence value invalid
eTriggerSendToInvalid = 30028 # Where to send trigger text to is invalid
eTriggerLabelNotSpecified = 30029 # Trigger label not specified/invalid for 'send to variable'
ePluginFileNotFound = 30030 # File name specified for plugin not found
eProblemsLoadingPlugin = 30031 # There was a parsing or other problem loading the plugin
ePluginCannotSetOption = 30032 # Plugin is not allowed to set this option
ePluginCannotGetOption = 30033 # Plugin is not allowed to get this option
eNoSuchPlugin = 30034 # Requested plugin is not installed
eNotAPlugin = 30035 # Only a plugin can do this
eNoSuchRoutine = 30036 # Plugin does not support that subroutine (subroutine not in script)
ePluginDoesNotSaveState = 30037 # Plugin does not support saving state
ePluginCouldNotSaveState = 30037 # Plugin could not save state (eg. no state directory)
ePluginDisabled = 30039 # Plugin is currently disabled
eErrorCallingPluginRoutine = 30040 # Could not call plugin routine
eCommandsNestedTooDeeply = 30041 # Calls to "Execute" nested too deeply
eCannotCreateChatSocket = 30042 # Unable to create socket for chat connection
eCannotLookupDomainName = 30043 # Unable to do DNS (domain name) lookup for chat connection
eNoChatConnections = 30044 # No chat connections open
eChatPersonNotFound = 30045 # Requested chat person not connected
eBadParameter = 30046 # General problem with a parameter to a script call
eChatAlreadyListening = 30047 # Already listening for incoming chats
eChatIDNotFound = 30048 # Chat session with that ID not found
eChatAlreadyConnected = 30049 # Already connected to that server/port
eClipboardEmpty = 30050 # Cannot get (text from the) clipboard
eFileNotFound = 30051 # Cannot open the specified file
eAlreadyTransferringFile = 30052 # Already transferring a file
eNotTransferringFile = 30053 # Not transferring a file
eNoSuchCommand = 30054 # There is not a command of that name
eArrayAlreadyExists = 30055 # That array already exists
eBadKeyName = 30056 # That name is not permitted for a key
eArrayDoesNotExist = 30056 # That array does not exist
eArrayNotEvenNumberOfValues = 30057 # Values to be imported into array are not in pairs
eImportedWithDuplicates = 30058 # Import succeeded, however some values were overwritten
eBadDelimiter = 30059 # Import/export delimiter must be a single character, other than backslash
eSetReplacingExistingValue = 30060 # Array element set, existing value overwritten
eKeyDoesNotExist = 30061 # Array key does not exist
eCannotImport = 30062 # Cannot import because cannot find unused temporary character
eItemInUse = 30063 # Cannot delete trigger/alias/timer because it is executing a script
eSpellCheckNotActive = 30064 # Spell checker is not active