Error 500 when trying to retrieve the inventory list (sandbox)

[grun8202]

Is anyone else getting a ‘500 Internal Server Error’ response when trying to get a list of inventory items (sandbox)?

https://api.sandbox.ebay.com/sell/inventory/v1/inventory_item

{
    "errors": [
        {
            "errorId": 25001,
            "domain": "API_INVENTORY",
            "subdomain": "Selling",
            "category": "System",
            "message": "A system error has occurred."
        }
    ]
}