'identifier' : illegal opcode for processor
The specified opcode is not valid in this context.
This error can be caused by using an instruction that is legal on a later processor but not on the current processor. In this case the problem can be solved by specifying a processor using, for example, the /G3, /G4, or /G5 options.
This error can also be caused by using an opcode that is valid for the processor but that is not handled by the compiler.