Unable to move Content Editor Webpart from one place to other

Issue

While moving the Content Editor web part from one place to another We get the following error message "Error On page" on the Bottom left of the IE.

 Or

 After moving the content Editor web part , when we click Exit edit mode . It gives "Unexpected error has occurred".

Cause

This usually happens whenever we copy the HTML code from one Content Editor web part to another. When we copy the HTML code it also copies the Web part ID and it conflicts.

Resolution

Open the Site in Firefox\Chrome browser as IE will not give you the Drop down to edit the webpart

Modify the Content Editor Web part

Open the Source Code

Remove the following Tag from the code for eg:- "id=WebPartWPXX WebPartID="XXXX-XXXX-XXXX-XXXX-XXXXXXXX"

Click Apply - OK

You can then move the web parts without any issues