The p-code file for the program (whose file suffix is .4go) has become corrupted. Recompile at least the module that contains the named function (preferably the whole program) and run it again. If the same error occurs, make sure that you are running both fglpc and fglgo at the identical version level. If you are, refer to the Administrator's Guide or Reference for your database server, for additional diagnostics. Contact IBM Informix Technical Support with the diagnostic information.