When the model is simulated it crashes ProcessModel at 312 hours, displaying any of the following error message:
Reason
There are 24/7 shift files in use.
Solution
Having 24/7 shift files is the same as not having a shift file at all. Remove the shift file reference.

Windows is checking for a solution to the problem

Main Program has stopped working

Pmmain has caused an error in PMSIM.DLL
Pmmain will now close.

Pmmain has caused an error in KERNEL32.DLL
Pmmain will now close.

Pmmain.exe has generated errors and will be closed by Windows.
You will need to restart the program.
An error log is being created.

Main Program has encountered a problem and needs to
close. We are sorry for the inconvenience.