Eclipse: Internal error occurred during "contact with software sites"

Question

I am using Eclipse Indigo. Every time I open "Install New Software", I get a popup with

"Contacting Software Sites" has encountered a problem. An internal error occurred during a "contact with software sites."

and when I click the details, I get the following message

An internal error occurred during: "Contacting software sites." java.lang.NullPointerException

This error does not allow me to install any software. Does anyone know a problem ?!

Answer 1

This happened in my eclipse some time ago.

what I did was that I expanded this error by clicking in detail in the pop-up error message, running the URL that called it, and deleting it in windows-> preference-> install / update-> Available Software Sites

Answer 2

Delete the files from the cache from the following folder and install from the help again → Install new software → [add update site URL] → etc ...

.eclipse\org.eclipse.oomph.p2\cache 

And this location should be in your user directory. For me it was like this:

 C:\Users\rahmanmahbubur\.eclipse\org.eclipse.oomph.p2\cache