Project plans internal server error

Hi,

I am getting the following whether I execute the /api/v1/projects/{id}/plan via c# or postman.
{
“success”: false,
“error”: “Internal Server Error (db92fd11-1b86-4abf-991f-0a9ee8d9e933)”,
“error_info”: “Please check developers.pipedrive.com”,
“data”: null,
“additional_data”: null
}

the endpoint works on one project but not another.
The endpoint where it does not work is an absolute minimal project, ie create project and only add the minimum info required to save it.

Thanks