Hi, I ran into a little something that is a bit annoying for debug when trying to upload files through the API with library_upload_from_import_dir.py. When the specified folder is wrong, python tries to process the error tuple like a dict, so the original error is hard to find. I modified a little the code to avoid that. It might not work in all cases but at least it solved my problem. Here is the original code: lib/galaxy/web/api/contents.py l.145->end else: rval = [] for k, v in output.items(): if type( v ) == trans.app.model.LibraryDatasetDatasetAssociation: v = v.library_dataset encoded_id = trans.security.encode_id( create_type + '.' + str( v.id ) ) rval.append( dict( id = encoded_id, name = v.name, url = url_for( 'content', library_id=library_id, id=encoded_id ) ) ) return rval Here is how I modified it: else: rval = [] try: for k, v in output.items(): if type( v ) == trans.app.model.LibraryDatasetDatasetAssociation: v = v.library_dataset encoded_id = trans.security.encode_id( create_type + '.' + str( v.id ) ) rval.append( dict( id = encoded_id, name = v.name, url = url_for( 'content', library_id=library_id, id=encoded_id ) ) ) return rval except: log.debug( 'HTTP Error %s: %s' % ( output[0], output[1] ) ) return None Since it saves me some time & energy I just wanted to share it, so I hope it can help. Best L-A