Dear all,<div>&nbsp;Recently I use dmrg of alps. I run three dmrg programs simultaneously and sometimes I get the following information, which stop the program.</div><div>&nbsp;I raise a question: since the dmrg write files while it is running, is there a problem when several programs run? These program may wirte the same files to the same folder, which will cause a problem. (I use the alps in windows 7).</div><div>&nbsp;Thank you very much.</div><div><br></div><div>Sincerely,</div><div>Huaiming Guo</div><div>&nbsp;</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><div>The group '/spectrum' does not exist.</div><div>Traceback (most recent call last):</div><div>&nbsp; File "C:\Program Files\VisTrails\Python27_64\lib\site-packages\pyalps\load.py"</div><div>, line 269, in ReadDiagDataFromFile</div><div>&nbsp; &nbsp; if 'results' in self.h5f.list_children(respath):</div><div>PathNotFound: The group '/spectrum' does not exist.</div></div>