When the following error message is received: could not find surface: 166, resetting to default projection could not convert error executing command: SUPERFACES error reading file *.blk Error in opening Blocking file the following steps can help to fix the blocking file: – Make a backup copy of one of your problematic blocking files – Edit the blk file in a text editor (it is just an ascii file) – search for “SUPERFACES” – all of your blocking face to surface projections should be listed in here – delete this whole SUPERFACES section – save blk file – try to load this new blk into ICEM