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'Specified method is not supported' error when deleting SharePoint site

I was getting a “Specified method is not supported” error when I tried to delete some test sites in SharePoint 2010 today. I found a great link that gave several solutions to deletion errors. Issue #1 under this link is what I needed:

SharePoint 2010: Unable to delete site/web after SP1

Even though I got an error executing the Upgrade-SPContentDatabase PowerShell command, it still fixed the problem with deleting the sites.