Windows Server 2008: ServerManagerCmd error

I tried to query the roles on my Windows Server 2008 system with ServerManagerCmd.exe and received the error shown below in red.

C:\>ServerManagerCmd.exe -query

Error: Configuration was started by another administrator.That administrator must log in to complete that action before other administrators can install or remove additional features.

I was looking forward to using this tool for server administration, but my first attempt failed. Searches on Google and the Microsoft forums did not help. Neither did the "Server Manager Scenarios Step-by-Step Guide", so I continued troubleshooting myself.

Installing the PowerShell feature

I decided to install the PowerShell feature manually. A dialog reported that another process was in progress, although I could not see it. I clicked Yes, which resolved the issue. I did not capture a screenshot of that message.