This error comes when you try to create new column in sharepoint.
Why this error comes?
1. column with same name is already created
2. or it is reserved.
it might be possible you create a column with name ‘abc’ then you delete it and again try to crate column with name ‘abc’ and it gives error
At such situation you can use below method:-
1. open create new column page
in address bar.
3. hit enter
now you will be able to create column with name ‘abc’