aapt not found under the right path

I just updated ADT, than the SDK and now I have in only one project the issue, that my aapt isn't found

Error executing aapt. Please check aapt is present at /opt/android/platform-tools/aapt

The path is correct, I checked twice and more times.

-rwxrwxrwx 1 martin martin 3,5M 2010-12-08 10:41 /opt/android/platform-tools/aapt

I can start aapt via console, the permissions are 777, I restarted eclipse, closed/reopened the project, restarted adb and finally my Ubuntu.

Some ideas why this might happen only at one project?

It seems that cleaning this specific project doesn't work but cleaning all open project does the trick.

I leave this question if someone else get this issue.

I found that this could be fixed by installing the ia32-libs package as the Android sdk requires 32-bit libraries.

I solved this problem by adding a / after my android-sdk path in...

Eclipse->preferences->android->SDK Location:

The aapt location has been changed recently. You can find it under:

/path/to/adt/sdk/buid-tools/android-[version]/aapt