Had the same thing happen to me but for a different reason. I created a database diagram called Employees. Then I deleted the Employees table from my database. Then when I tried to recreate the table, it says I can't because it already exists. Deleting my database diagram was what worked for me. Table didn't exist in the diagram visually but might be persisting somehow and any attempts to delete, select, update from the original Employees would result in an error.