Activating theme | File not found error

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After hours looking at this really nice "File not found error", I remembered to go back to my old batchfile wsp installer.

Since I need to change the SPTHEMES.XML theme list file, I use Linq, which seems to come up with .NET Framework.

Turned out to be missing "System.XML.Linq" reference in the SharePoint Server.

Installing .Net Framework 3.5 fixed the problem

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