Receiving com.atlassian.jira.issue.customfields.view.CustomFieldParamsImpl cannot be cast to java.util.Map error when trying to use "Set Field Value from Parent Function" post function

Description

Hello,

I have a custom field called "Category" which is a "Cascading Select" type and I'm showing that field on all my issues (including sub-tasks).

In an effort to help keep sub-tasks tagged as the same category as their parent, I tried using the "Set Field Value from Parent Function" post function to set the Category on one of my transitions in my workflow.

However, I'm getting this error:
Error occurred while creating issue. This could be due to a plugin being incompatible with this version of JIRA. For more details please consult the logs, and see: http://confluence.atlassian.com/x/3McB com.atlassian.jira.issue.customfields.view.CustomFieldParamsImpl cannot be cast to java.util.Map

It seems that you have tried to perform an illegal workflow operation.
If you think this message is wrong, please contact your JIRA administrators.

I verified that my plugin version is 2.5.7.1 and my JIRA version (download) is v5.1.6

Am I doing something wrong?

Thanks!

Nathan

Environment

It is in my dev environment

Customer Info

None

Assignee

Unassigned

Reporter

NathanG

Labels

None

Internal Complexity

Unknown

Internal Value

Unknown

SEN

None

Requires documentation

None

Impact

None

Fix versions

Affects versions

Priority

Major
Configure