I am trying to save a TC18 Platinum file to DWG. However, I get the attached error message. I do not get an erro message when I create a new drawing.Therefore, i suspect that my file has errors in it. Is there a command or routine (similar to Autocad's Audit / Recover) that allow me to remove errors? I have managed to save the file to DWG using TC17 Platinum but I do not want to rely on 2 versions of TC.