Blaze Issue

I have a set of Blaze rule and have been deployed to the Developer. When I run the blaze flowservice on developer I get the error:

Could not run ‘ABC’. com.blazesoft.server.base.NdServiceSessionException: Service session Id number 30.
Service ‘ABC’. Server ‘ABC’ on host ‘DEV01’.
Evaluation error
Expression produces unexpected value: unknown.

I am using blaze rule for the first time and have to fix this defect. Can someone show tell how to go about fixing this issue.


It was because of the Compilation Error.