I wanted to create a JFrame (got all the Swing libraries needed) but this is what shows up on the design tab. I've been looking for similar problems but it only shows some other specific numbers , for example "Eclipse is running under 1.6" or "1.7" etc. But never have I seen "Eclipse running under 0" , what does this even mean? I uninstalled java and eclipse and re-installed them all over again...same problem. The execution works fine but I want to be able to edit the look of the frame on the design tab too.

[![enter image description here](https://i.stack.imgur.com/nshXO.png)](https://i.stack.imgur.com/nshXO.png)