I want to be able to generate junit html report in soapUI using groovy after running the testsuite.

Thank you for posting to our Community Forum. 

You can use the TestRunner GUI to run a TestSuite and generate a report after execution. 

Here is documentation that can guide you further: https://support.smartbear.com/readyapi/docs/soapui/running/automating/gui.html

Have a great day! 

it still is not working when I try the test runner I get an error.