This is not a very helpful error message because it doesn't really point out where the error is. I've gotten this error before, after I upgraded from fasm 1.52 to 1.53 I think. I later found out that I needed to add endp to the end of procedures and this fixed the problem. Now with fasm 1.54 and above I am getting this error again. What else should I look for that may be the cause of this problem?

I've found the problem. It's the new struct macros. I had declared a struct using the old macro syntax.