An internal error occurred during: “Launching Project”. java.lang.NullPointerException

Question

My android project was compiling well but suddenly it stopped launching. Then I tried to launch other projects from Project Explorer and all project threw same exception:

Answer 1

I had the same issue.

Non of my project in the workspace would run and I would get the same message "An internal error occurred..." and details would just say something about a Nullpointer. This happend after I did some updates and all projects in the workspace started giving the same issue.

It took me some time to find the problem:

When I go to configuration of the project (Run Configuration...) I could see that "Project" in the configuration settings was empty. So my update removed the projects from the configurations. Once I put back the project in the configuration again problem was gone.