BizTalk Error: System.IO.FileNotFoundException: The system cannot find the file specified.

After deployment of my BizTalk solution to the TEST environment, I was experiencing this error on a given receive port. I was not having this problem earllier on my local DEV BizTalk server/machine.

2014-11-06 09_03_29-AP60TST - MultiDesk

Don’t be mistaken when you see this error, this is not an error related to the adapter. I found other blogs stating this had something to do with the DLL’s of the solution not being the correct version. So I redeployed everything (using the BTDF), but without any success.

In my case, after browsing the GAC and comparing my DEV with the TEST environment, I found out that my deployment  was missing a Custom Functiod in the GAC that I was using in my map. After fixing this in my BTDF deployment script and redeploying, the error was gone.

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