I had the same problem with the example application. I couldn't find the 3.7.2 version so I went to the git project
https://github.com/eyck/grails-birt-report,
downloaded it
upgraded it to grails 2.1.0
copied the lib from 3.7.0.1
ran grails package-plugin
and installed the new plugin with
grails install-plugin ~/Downloads/eyck-grails-birt-report-9512a57/grails-birt-report-4.2.0.1.zip
into the birt-report-test example application.
I am still getting the same error.
Can you point me to the 3.7.2 version or tell me what I can do to get this working? Also, I'm not sure if I have the right jars in the lib directory of the 4.2.0.1 plugin as the lib directory in git is empty.
Thanks for your assistance.
Regards,