BizTalkAssemblyResourceManager failed to complete end type change request.

Again, another cryptic BizTalk error.

I was deploying the orchestrations from VS2005 to my local machine, when I got this error:

Failed to add resource(s). Change requests failed for some resources. BizTalkAssemblyResourceManager failed to complete end type change request. Object reference not set to an instance of an object.

I found this error meant that the assembly for the orchestration was deployed, but the entry in the BizTalk Management DB was not successful. Re-deploying the orchestration will not work as it wants to re-deploy the assembly too!

In order to correct this error you:

1) Find the assembly which failed in the Assemblies section of the BizTalk Explorer.
2) Undeploy the assembly.
3) Re-deploy the orchestration using right click -> Deploy

Everything should be fine now!