How do I solve this error? I tried:
- Refreshing the project, and rebuilding. 
- Cleaning the project, and rebuilding. 
- Closing and reopening the project, and rebuilding 
- 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. 
- Deleting the project, deleting the - .projectand- .classpathfiles in the project, and creating a new project using my files as existing sources.
None of these worked. How do I solve this problem?
 
     
     
     
    