Try editing the "location" the machine in question uses. I don't think you need to change any settings just need to resave it. I figure there's a missing value or improper tag that gerasim server wants.
There's a thread on this in gerasim boards, seemed vague until I just did it.
Found this in their thread:
"Usually that happens when PC has global prefs from WCG or SAT@home. In that case global prefs has invalid xml format.
*global prefs included in scheduler request.
Solution: keep global prefs in another project."
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