I am having same error mentioned by kenneth in the thread below. This is just started today.
Kenneth has also posted his server log few posts down. My server log is also with the exact same description.
This has really scared me as Kenneth was not able to find a solution.
Error is so readom and I do not even know what to try. PDM server restart didn't work.
We are on SolidWorks 2010 SP4.0
If anyone has any suggestion, let me know.