Eclipse logcat debugging

Question

I have a beginner question, I want to debug my app and i don\'t know how to use the Logcat properly.

Right now, I am getting this error and i don\'t know what it mea

Answer 1

It says it's NullPointerException at 49 th line on Start.java file.

Logcat allows you to filter you your all logs from left pan. Which is the best thing over there.