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Can't add dll reference to WP8

Apr 20, 2014 at 5:24 PM
Hi, I tried adding WeiboSdk.dll as a reference in my Windows Phone 8 solution, targeting Windows Phone 8.0. But when I add it as a Reference, I get an error:

Microsoft Visual Studio
A reference to a higher version or incompatible assembly cannot be added to the project.

I'm using Visual Studio 2013 Ultimate and Windows Phone 8 SDK. Isn't this WeiboSdk.dll suppose to work for WP8?