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E-IF, Invalid syntax
SIC, IF command. The second argument of the command (if present) was not THEN.

E-IMPLICIT, Invalid variable name <string>
SIC, LET command. A variable used in the implicit loop has an invalid name. Variable names must be shorter than 15 characters and begin with a letter.
User action : Use a valid variable name.

E-IMPLICIT, Too many variables
SIC, LET command. The total number of variables defined exceeds the SIC limit. Temporary variables used in implicit loops are included in this count.
User action : Delete a few useless variables and retry.

E-IMPLICIT, Variable already exist
SIC, LET command. This is an internal logic error.
User action : Submit an SPR. While waiting for the correction, you may try modifying your expression.

E-INCARNATE, Bad incarnation type
SIC, type conversion routine. The type conversion routine was called with a non numeric output type. This is a programming error.
User action : Notify the programmer.

E-INCARNATE, Bad variable type
SIC, type conversion routine. The type conversion routine was called with a non numeric input type. This is a programming error.
User action : Notify the programmer.

E-INTER, Ambiguous command, could be :
SIC, monitor routine. The command name is ambiguous.
User action : specify more characters or specify language to avoid ambiguities.

E-INTER, Ambiguous option, could be :
SIC, monitor routine. The option name is ambiguous.
User action : specify more characters.

W-INTER, No command on line
SIC, monitor routine. A command line only contained the language field.

E-INTER, Too many words in line
SIC, monitor routine. The user program tried to access more than 100 arguments. This is a programming error.
User action : if you really need so many arguments, submit an SPR.

E-INTER, No options allowed for command <String>
SIC, monitor routine. The command has no options.
User action : Suppress options from the command line.

E-INTER, Unbalanced quote count
SIC, monitor routine. A command line has an odd number of double quotes.
User action : Correct typing mistake and reenter command.

E-INTER, Unknown command
SIC, monitor routine. The command does not exist in any active language.
User action : check spelling or bring more languages in the active scope (Command SIC$\backslash$SIC).

E-INTER, Unknown command <String> for language <String>
SIC, monitor routine. The command does not exist in the specified language.
User action : check spelling.

E-INTER, Unknown language <String>
SIC, monitor routine. The specified language is not known.
User action : Check spelling. If good, verify you are using the right program.

E-INTER, Unknown option <String> for command <String>
SIC, monitor routine. The command has no such option
User action : check spelling.