[Solved] Sync Error

Hi,
I am trying to sync zotero with my library from a desktop pc running windows 7. This desktop has already a previous version of my library and now I am trying to update that version with the current version of the library. After many attempts, zotero keeps sending me the following error message:

[unrelated errors removed — D.S.]

[JavaScript Error: "[Exception... "'Cannot move collection "International relations" into one of its own descendents' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "" data: no]"]

[JavaScript Error: "[Exception... "'Cannot move collection "International relations" into one of its own descendents' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "" data: no]"]

Is there anyone who knows how I might try to work this out?
Many thanks in advance.
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