8.20 is a very old version of NC. You should try an up-to-date version.
Please look above in the log file - usually the
reason may be found there.
Something like missing/ uncompelled system task/library
In reply to Brodov Dmitriy:
i do not see any such message in the log file.
Nope i dont have PLI or model but i do have a script(makefile) to run the sim.