The versions of ACEPREP and ACEGO must agree. (To check the version of either program, run it from the command line with the -v option.) To recompile the report, use a version of the compiler, ACEPREP, that is identical to the version of the runner, ACEGO. If the versions are already the same, recompile the report anyway to ensure that the .ace file has not been corrupted. If the error recurs, note all circumstances and contact IBM Informix Technical Support.