@Override is not allowed when implementing interface method
extjs, gxt, intellij-idea, java, overriding
Solution
If your project has multiple modules, also check that every module uses language level 6 or above, or use the project's language level (see `Project Settings > Modules > xxx > Language level`).
You may need to reload your project once it is modified.
Problem
I have the problem mentioned in the title. You could say that this thread duplicates another one: How do I turn off error validation for annotations in IntelliJ IDEA? But the solution given there doesn't work. They say that I need to take the following action: In the Project Structure | Project dialog, change the Project language Level to 6.0 - @Override in interfaces. However, the Project language Level is 6.0 at the moment, but I still see the error. Vic, here is the window and there is no JVM version right under Language level (unfortunately I can't post images because I have 10 reputation)