Error in Launchpad - Assign Transport requests

Hi,

On clicking the setting button in Fiori Lanchpad Admin. I am getting the following error on clicking the setting icon which should prompt for a request selection:

Error (400, Bad Request) in OData response for GET "/sap/opu/odata/UI2/TRANSPORT/WorkbenchRequests?$filter=isDefaultRequest eq true": HTTP request failed Details: Choose an existing request.