Hi Atlassian support,
We have an issue accessing the board configuration. When I click the "configure" option below, the configuration page was blank.


I tried to look up the endpoint of /rest/greenhopper/1.0/rapidviewconfig/editmodel.json as suggested here (Section of Diagnosis for Root Cause 4), and I got this "First should not be null" error in response.

It is not clear to me as to what "First" means and what are the suggested steps to debug this error. Could you provide any advice, please?
Thank you.