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It seems to me, that this is happening, due to one of the modules you have installed, but I can't pinpoint it, and don't have the time to drill down into this any further, sorry, but what you could do is (very dedious though, so you might want to leave it, as it's no mayor error):
- one after another, deactivate your modules
- until said error disappears
- then you have the culprit
Sorry I can't be of more help....