The VRC design manager presides over operations that take place while the user is in a design session. There can be 50 design sessions open at one time.
Most design manager error messages can be avoided if you check for the following issues:
Make sure that you are in the correct VRC view for the specific operation you are trying to execute. Most operations that involve the design manager take place in the Design View.
Your scope is the piece of the network over which you have administrative privileges. Only one user can administer a particular scope at a given time.
Some operations can occur concurrently, but others can only be handled by the VRC server one at a time. If an operation cannot be executed because it cannot be initialized, wait a few moments and try again. VRC might be waiting for an operation to complete, or an operation must be in the initialized state before you can execute it.
When you encounter design manager error messages, use the console to set the debug of the subsystems for the dial plan generation (DPGeneration) and dial plan controller (DialplanCtr) to on.