I’m sure it’s something simple, but I have over 100 errors like:

and:

I pointed in the Edit Configuration to the right location of Tomcat, so what am I missing ?
Edit:
O.k, thanks to @CrazyCoder I added Tomcat to the Module Dependencies, so now I have left with one module that I don’t know where it should be: JUnit:

Edit 2:
@CrazyCoder gave the answer: %IDEA_INSTALL_DIR%\lib\junit-4.10.jar
Add Tomcat application server to the Module Dependencies with the Provided scope.