Description
Error 947 means that a new network server .cm file cannot be activated because dialogs are suppressed (because CMServer is running as a Service).

Solution
Step 1) Stop the CMServer service (eg, through the Services management window)
Step 2) Run CMServer (eg, by double-clicking it) - the configuration dialog will appear. Check that it is configured to install/start as a Windows Service.
Step 3) Click the Start button.
Step 4) It should now be able to display any required dialogs to activate the .cm file before installing/starting as a service.