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Could not enlist orchestration Object reference not set to an instance of an object.

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Error :
Could not enlist orchestration  NullReferenceException exception occurred while the XLANG/s runtime enlisted a service.
Error message:Object reference not set to an instance of an object.

Cuase:

After importing BizTalk MSI file from one BT server to other server, When I tried to start BizTalk Application got this error.

 The BizTalk Application Assembly was not installed in GAC.

Solution:

GAC the BizTalk project assembly  and restart host instance, then Start you BizTalk Application.It should start now without any error.
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