artturner
This popped up the other day on my DAW. Sorry but I'm not very methodical on trouble-shooting...I either changed the file name to something shorter or took out a hypen or some other character and it saved. I haven't seen the problem again. But it was an unexpected and never-seen-before error.
Interesting. In my project I had imported an external audio file, which may have had a non-alphanumeric character in the file name such as a hyphen. It seems like a long shot, and I'm guessing you are referring to the project filename anyway, but worth me checking out