Question

How do I solve this error? I tried:

1. Refreshing the project, and rebuilding.

2. Cleaning the project, and rebuilding.

3. Closing and reopening the project, and rebuilding

4. Deleting the project (but not deleting the files — that’s a
   checkbox on the project deletion confirmation dialog), and re-
   importing it as an existing project, and cleaning and rebuilding.

5. Deleting the project, deleting the .project and .classpath files in the
   project, and creating a new project using my files as existing
   sources.

None of these worked. How do I solve this problem?

Answer 1

update platform sdk version to rev 21 it can be solved.
I updated platform SDK from rev 20 to rev 21, and restart eclipse, it’s solved.