How to solve the issue of "The server instance specified was not found. Please specify the server's address and port."?

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Today, when I want to use "stsadm -o addwppack..." command to add a web part into the team website, an error message returned

"The server instance specified was not found. Please specify the server's address and port"

Fortunatelly, I seeked for the help from Mohammed's blog:

Top 3 Reasons for the "The server instance specified was not found. Please specify the server's address and port." Error

My issue is the 1st reason that we have installed sharepoint SP1 build, but didn't upgrade all the virtual server, after I run following command, the web part could be added successfully.

stsadm -o upgrade -forceupgrade