Recently when trying to deploy a complex Microsoft Reporting Services definition to a server, I received the following error:

Exception of type Microsoft.ReportingServices.ReportProcessing.ReportProcessingException was thrown.

That error is pretty unhelpful.  It turns out that there was user defined function that I was calling that had not been pushed to the server.  After putting a required dll into the public assemblies library on the server, things worked properly.

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