Error Occurs when attempting to copy from Unfiled Items to Group Collection

Every time I use "Add Item by Identifier" now the reference is added to Unfiled items. When I attempt to copy the reference to a group collection I get the following error "An error has occurred. Please restart Firefox. You can report this error..." The error ID generated is 1120057678
I am using 3.0b1 on FF 6.0.
  • http://forums.zotero.org/discussion/19252/cant-copy-from-zotero-group-into-local-zotero-standalone-libraryid-1189596731/#Item_2
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