I don't understand the error on eclipse

Please somebody c开发者_Python百科an help me with my error, there is nothing on console, but I can't run the project. This is creenshot:

thanks for help

Click on the Problems tab at the bottom, see what the error is.

Clean your projects by going

Eclipse>Project>clean

Try cleaning the project (menu/Project/Clean). The project tree looks as if there's a compilation error in one of the files - there's a red "x" on the project; typically, the similar "x" would be on the problematic file. Which can be a source, or a resource, or the manifest. Open up the tree and try to find one.

I think it is the build path, maybe you forgot to add a library or move it.