OS X Mavericks :: Can't Reset Advanced Mail Preferences

Using Mail 7.3. In response to the piling up emails on all devices I went into advanced setting under Mail preferences and set it to removed emails from the server. I immediately realized this wouldn't work bc now I can't get my email for that email account on my iPad. It goes to my desktop and then no other devices.  

When I go back to reset that so it doesn't delete from the server I get this message: Invalid Directory

The account path /Users/emma/Library/Mail/V2/POP-Info@movementsofthesoul.org@mail.movementsofthesoul.org is already being used by the account “cmos” 

It won't let me Save the change. Apparently it doesn't like that I have two email addresses (accounts) with that domain.