Got this error in an application:
There was a failure executing the receive pipeline:
Source: "Flat file disassembler" Receive Port: ... URI: ... Reason: The document specification ... from assembly
... failed to load.
Verify the schema for this document specification is deployed and is in the Global Assembly Cache.
Google gave a lot suggestions. Tried them - they did not work.
Ended up renaming the schema.
And after several deployment issues (some requirering restore of BizTalk databases) it ended up working.