edit box wp-admin url

When i try to set the url of a page in wordpress (4.2) it keeps apending -2 to the end of the url, i guess its becuase this ulr already exists, but i checked and it dosnt, although at one time it did but that page has since been deleted. Any idea how i can use the url i want and get it to stop apending -2 ?

This is what im seeing the wp-admin dashboard when trying to change the url :

The edit box :

Once i click OK :
once i click ok on changing the url

Read more here: Stop WordPress appending `-2` to the end of my url after i change it


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