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Typechecker looking for "nil" file in current context


I have recently installed PVS and I get an error whenever I try to 
typecheck. After running the typecheck command, I get the following error:

error in process filter: Opening input file: no such file or directory, 

... where /home/mike/ is my current context. After that, none of the 
parsing, typechecking or proving commands will work. If I then reset 
PVS, it typechecks the file once as it should but any subsequent 
typechecks produce the same error. Thus I seem to have to reset PVS 
everytime I want to typecheck.

I'm running PVS 3.1 on RedHat Linux 9 with GNU Emacs 21.2.1

Can anyone help?


Mike Greiner