When using ColdFusion Builder (or I'm assuming any SVN client), I recently receive an error "Entry already exists". This was happening because I renamed a folder that was already in version control. Since this was a "new" folder in SVN but it also had a .SVN hidden folder, it thought that the folder was already in version control. Even though it technically was (under a different name), I wanted it with this name in my SVN.

All I needed to do was delete the .SVN folder in the folder I renamed, and re-commit.

Instantly, it worked!