Autodesk Inventor Simulation 2009 Couldn’t create database

Hi guys,
I have a problem with my Autodesk Inventor Simulation 2009, while I was using the application and saving my file. Autodesk Inventor Simulation 2009 stopped and displayed an error message, the error message stated that it could not append the file that I am trying to update, I posted below the screen shot of the error.
Autodesk Inventor Simulation 2009
Couldn’t create database… Exception:
Unable to append data to file.
OK
After I got the error message, I restarted my computer in hope its just a glitz, but when I am back to my usual work, after a short while I tried again saving my file, the same error message appeared on my screen. Please help me figure out what went wrong, thanks a lot.
