title: Java/eclipse: Why can't I run a prog with package by Run Configuration? Pic inside
body: <p>Someone help me please? I don't know why can't I run a simple program by the run configuration. If I don't set a package in the beginning it works.
  <img src="https://i.stack.imgur.com/J71IJ.png" alt="enter image description here">
  I attach a picture of my screen</p>