Help? Last night I closed a drawing no problem with it and no error messages. So this morning I "try" to open that same drawing like I have done several days before, but this time I get an error message "!savers.cpp@154;efilererror" Help I have a presentation and need that drawing. Somebody help please

Download DWG TrueView and see if you can open it.  If you can then save it to a different version's file format like 2000.