duplicate namespace prefix

Hello, I am in the process of setting up a server that is running to invocations of dovecot. One of the invocations is acting as a backend and the other as a Director. I believe I have most of the configuration complete but I keep running into the following error:

Jul 01 14:17:04 lda(postmaster@mydomain.com: Error: user postmaster@mydomain.com: Initialization failed: namespace configuration error: Duplicate namespace prefix: "" Jul 01 14:17:04 lda(postmaster@åmydomain.com: Fatal: Invalid user settings. Refer to server log for more information.

Not sure where to go from here and most of my searches on the error have lead me to dead ends hoping someone can help me out.

Thanks.