CC: Can't Continue DD: Duplicate Definition DZ: Divide by Zero FT: Formula Too Complex IL: Illegal Function Call MO: Missing Operand NF: Next Without For OD: Out of Data OM: Out of Memory OV: Overflow RG: Return Without Gosub SN: Syntax Error SO: Subscript Out of Range (Access out of range of an array) ST: String Too Long TM: Type Mismatch TP: Tape Read Error UL: Undefined Line Number