SysAid REST API - Action Items

According to the documentation, we should be able to retrieve the action items for a given service request using the following URL:

GET/action_item?view={view_name}&fields={field1,field2..}&type={type}&archive={archive}&ids={id1,id2..}&staticFilterId={filter_id}&{filter1}={filter1_value}&{filter2}={filter2_value}...&query={search_criteria}&offset={offset}&limit={limit}&sort={field}&dir={dir}...

The only required parameter is ids - a list of comma separated SR IDs to return their action items.

However, when I issue an authenticated request to the URL above, I always get a 500 response code with the payload below:

{'status': 500, 'message': None}

What could be causing the server side error?

References:
https://community.sysaid.com/Sysforums/posts/list/13563.page#ActionItem
https://community.sysaid.com/Sysforums/templates/default/help/files/Guide_REST_API_Details.htm#Getactionitems