"An error has occurred" While exporting OOB CEWP (Content editor web part)

Today, I wanted to create a reusable content editor web part. So I thought of crating one and then exporting it and import lator.

But when i clicked on export button on Content editor. It thrown me error as below:

So the Solution was:

I was using localhost in the url which was throwing me error. So when I replaced it with my computer name I was able to export.