Hi Ki-Soo
Its just happened to me with a different project.
Here's a theory on how this is happening.
1) Compile project that has an error. Error will show up in problems.
2) Close project.
3) Open project
4) fix error
5) compile -> there will be no error on the console, but "problems" still has a problem, it shows the error at step 1).
Closing and opening the problems window does not solve the problem. Hmmm, and closing and opening CCS didn't solve it either. Wow. Its just not updating period.
Deleting the project and importing again solved the problem, well kinda - if you don't mind importing each time you want to update the problems window.
Cheers