Hello,
I finally was able to successfully run an example test script in ScriptRunner (it failed over and over again, then after I stepped away and returned, it magically worked.)
I am testing the Sum up story point below an epic test script.
It looks like it worked. See below screenshot. The sum of the story points is accurate. 
Then when I click through to the stories within Jira and click the Scripted Fields field, then I get this error. I have checked the inputs, and they appear to be accurate. Any ideas why I am getting this error?
