Okay, so I kept getting this error and it finally dawned on me that it means exactly what it says, lol. I was trying to run a stored procedure and had selected one field two times like this:
SELECT M.name, A.address, A.phone, M.email, M.name FROM members M inner join address A on M.id = A.id;
I selected name twice without renaming it and this is what caused the error. Silly me.