As stated by others, you can't "disable" fatal error messages. They mean that whatever you were asking Creo to do, something went wrong and the program crashed. The error is generated by the system.
If this is happening during a batch process, some guesses as to the cause:
(1) One of the models you are trying to process is corrupted, and causes Creo to fail. Is there a log file generated by the batch process? If so, you could read through it and find out where the trouble is occurring, and investigate further. I've had processing fail due to someone renaming a part that was referenced in a drawing, making the drawing unable to be retrieved.
(2) When batch processing files, is there a way to tell Creo to erase the previously processed file from memory? Depending on the size of the files, you might be using up all the memory available, or opening too many files. This will definitely cause a crash, as I've seen in normal Creo usage. I had this problem when processing 100s of files to create DXF files from drawings. The process would be okay for a while, but die when a certain number of files was reached.
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