A dial plan with the simple name "{0}" already exists. Every dial plan must have a unique simple name (SimpleName), which ...

A dial plan with the simple name "{0}" already exists. Every dial plan must have a unique simple name (SimpleName), which you can set by using the -SimpleName parameter. Or, open Lync Server Control Panel, click Voice Routing, click Dial Plan, double-click the dial plan that you want to modify, and then type a new name in Simple name.