Strange build error message

Have you ever seen the following error in the build window

CEFilter error. Missing "@CESYSGEN IF" statement(s) detected

and then been looking around where this comes from?
This week I got a BSP and - what wonder - immediately built an image. The strange thing was: nk.bin was created successfully but I always got the abovementioned error message!

First, I started counting the "CESYSGEN IF" and "CESYSGEN ENDIF" statements in ce.bib, reginit.ini, initobj.dat. Everything seemed to be fine.
Then I found a post here web. (thanks for the solution, "Treadstone").

So, do not forget to search also the dirs files for unmatched CESYSGEN IF/ENDIF statements.