IBM1936I S Invocation of compiler backend ended abnormally.

This is a severe error message issued while compiling a PL/1 pgm


Explanation:
The back end of the compiler either could not be found or else it detected an error from which it could not recover. The latter problem can sometimes occur, on Intel, if your disk is short of free space and, on the z/Series, if your job's region size is not large enough. Otherwise, report the problem to IBM.