Groovy script failure

[invinci]

Hi,
I am facing issue with running a groocy script in the ScriptRunner which is throwing a strange error. The original script was waorking in Jira 6.3, but now we have upgraded Jira to 7.0.11. 

The error from running the script is

Error
No signature of method: com.nimblestorage.jira.PopulateQaContactListener.main() is applicable for argument types: ([Ljava.lang.String;) values: [[]] Possible solutions: wait(), wait(long), find(), any(), wait(long, int), init(java.util.Map)

Why is the script trying to find a main() method?

The stack trace shows 207 logs with failure at

2017-04-18 08:14:08,030 WARN [common.UserScriptEndpoint]: Script console script failed: 
groovy.lang.MissingMethodException: No signature of method: com.nimblestorage.jira.PopulateQaContactListener.main() is applicable for argument types: ([Ljava.lang.String;) values: [[]]
Possible solutions: wait(), wait(long), find(), any(), wait(long, int), init(java.util.Map)

What can be done to address such issue?

Am I doing somethign wrong here? Please let me know.

Thank You.

[Nic Brough -Adaptavist-]

Duplicate of https://community.atlassian.com/t5/JIRA-questions/Groovy-No-signature-of-method/qaq-p/578284 which has more information.