In P6 R8.3 publish or summarize I sometimes get completed with errors

In P6 R8.3 publish or summarize I sometimes get completed with errors, but no information on what the error is. How do I get detailed error information so I can fix the problem?

I attached a summarization log as an example. The publish log is even more cryptic, everything looks good untill the end of the log and it states "Completed with errors" but no listing of the errors.