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

In my case, it was because I was running it with Debug As -> Android Native Application, while the emulator was closed (I debugging on the emulator, not on a real phone).

I needed to first start the emulator using Debug As -> Android Application, after which Debug As -> Android Native Application will work.

Close the emulator and the error re-appears. My conclusion is that Debug As -> Android Native Application won't work unless the emulator is already started.