You'll have to find the bad character or morph install and delete it. If you can recall what you installed right when it started then you can unwind it. Otherwise you'll have to manually lookup what's going wrong in the log file. 200 Morphs has that problem and a few other characters. IIRC it doesn't really affect anything other than stretching out the character load times to unreasonable lengths.
I had this problem and found that this suggestion I received worked well.
' Open your log file, delete everything and save it. Then load the base figure where you get the duplicate content error and open the log file again. You should then see the file that is dublicate in the log file more easily. It looks something like โDuplicate formula found linking โฆ.โ