Hi, I created a data libraries and imported files into it (from local path with symlinks) There are 1500 files in that directory. Now when I attempt to view the library I get this error: Error attempting to display contents of library (test lib): 'NoneType' object has no attribute 'dataset'. What is the problem here? regards, Andreas -- Andreas Kuntzagk SystemAdministrator Berlin Institute for Medical Systems Biology at the Max-Delbrueck-Center for Molecular Medicine Robert-Roessle-Str. 10, 13125 Berlin, Germany http://www.mdc-berlin.de/en/bimsb/BIMSB_groups/Dieterich