* 14 '''String space full''' - String memory area is full.
* 15 '''String to long''' - String may not exceed 256 characters.
* 16 '''String expression too complex''' - A string expression need to be broken down into smaller expressions.
* 17 '''CannotCONTinue''' - CONT can only be used if program was stopped by [ESC] or a STOP in program - not after END.
* 18 '''Unknown user function''' - A DEF FN must be executed before calling an FN function.