Request to data source "SkuidLocal" failed

I'm getting the following error when trying to add a new authentication provider for Salesforce on Skuid Platform:

Request to data source "SkuidLocal" failed. : Internal Server Error: An internal server error occurred

I've double checked I've followed all the steps at https://docs.skuid.com/latest/en/data/salesforce/, but can't seem to figure out the issue.

Anyone seen this before or know what might be the cause?

Thanks in advance,
Andrew