I am trying to apply TICA to reduce dimensions to some data: reader = pyemma.coordinates.source(files, top=pdb) # create reader reader.featurizer.add_backbone_torsions(periodic=False) # add feature tica = pyemma.coordinates.tica(reader) # perform tica on feature space however I get an error and the following legend. mdtraj\formats\xtc\xtc.pyx in mdtraj.formats.xtc.XTCTrajectoryFile._read() RuntimeError: XTC read error: Compressed 3d coordinate What would be the reason? please any suggestion