I can not put together a project. All the time there is such a mistake. What is it and how to deal with it?

Errors occurred during the build. Errors running builder 'Android Pre Compiler' on project 'XXX'. java.lang.NullPointerException

    1 answer 1

    Most likely the problem is in the streams. You are trying to access null. How exactly I don't know yet, I only get to know java myself.