Unable to import dataset from history into data library

Dear Galaxy Users, Since I've updated my Galaxy version I'm unable to import any dataset from my history into my data library. It returns a message of e.g. "Invalid item id (1464) specified". I then did a complete new test installation to make sure that this problem wasn't because of the update. But the error still remains. I've included a screen shot that reports the error. When a queried the database the dataset id does exist in the history_dataset_association table. I went through the paster.log file and found the following warning message: Unknown library item type: <class 'galaxy.model.HistoryDatasetAssociation'>. I'm sure this is the problem and would need to find a way to fix it. Does anyone have the same issue? Thanks, Gerrit
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gerrit