Issue transition postfunction no longer working

Description

We have mail handlers configured for 3 different projects designed to reopen issues if they are commented on by email. Recently it has come to my attention in our atlassian logs that it is indeed commenting but is no longer reopening the issues. Jira throws the following error:

I have checked and double checked permissions and roles and everything is as it should be but none the less, it still fails

Environment

Windows Server 2008R2, JIRA 6.3.4

Preliminary Test Cases

None

Assignee

Tibor Hegyi

Reporter

Joel Parker

Access to limited visibility issues

None

Product platform

None

Module Dependency

None

Fix versions

Affects versions

Priority

Major
Configure