SKY API - Action list (All constituents) returns 500 status code

Hello! When I try to use the Action list (All constituents) operation in the SKY API, it returns this error:

HTTP/1.1 500 Internal Server Error

cache-control: no-cache

content-length: 36

content-type: application/json; charset=utf-8

expires: -1

pragma: no-cache

{

"Message": "An error has occurred."

}

I've been able to use all the other operations I've tried (Constituent list, Gift list, etc) with no issue. Also, the Action list (Single constituent) operation works without issue.

I'm using Entrinsik Informer to make calls to the API, but I get the same error when just using the “Try it” button in the API reference.

Thanks for your help!
Tim