WP Category Slug is already in use by another term?

Sometimes category permalinks does not look as i want them and while editing category name i get this msg:

How can i fix.

 

You can edit the first or the second. Two pages can't have the same URL.

 

Thanks, there was category abc name already exist and i was using same for tags.

 

Go check your trash. If you tried to remake a page but didnt remove the original you cant create the same URL until you delete the old one from the trash.

N.