Failed to execute goal de.saumya.mojo:gem-maven-plugin:1.1.5:exec (default) on project referenceapplication-omod

Thank you for help and sharing your idea @dkayiwa. It motivates us to investigate and look for solution.

I looked and tried different ways and the finally the Ref App Module is built successfully. I just delete all the folders in (.m2/repository/ ) and build it again with following command

mvn clean install -DskipTests=true

I feel that there was conflict between old and new version of libraries.