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You are unable to create a Service Instance of REST Service Type from the SmartObject Tester Tool.
the following error occurs:
"SmartObject Server Exception: Service Instance filename not specified"
After investigating the assembly used for the rest broker, we found there was a version difference between the clients environments.
The assembly in question were located at:
Program Files (x86)\K2\ServiceBroker\SourceCode.SmartObjects.Services.Endpoints.Rest.dll
To resolve this, please do the following:
1. Take a backup of the assembly to a different location.
2. Stop the K2 service.
3. Replace the assembly from a working and matching K2 version environment with the same Cumulative update and Fixpack.
4. Start the K2 service.
Now when creating a rest service it works as expected.