UpdateSource must be set before calling CheckForUpdates()

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Feb 25, 2019, 4:21:28 AM2/25/19

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Hello guys. I try ti integrate wpfsampleapp in my tool to test it but still have errors. Here is the error :

System.InvalidOperationException: 'UpdateSource must be set before calling CheckForUpdates()'

at line :

((UpdateProcessAsyncResult)asyncResult).EndInvoke();
this i in checkforupdates()

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