Post request returns error all the time

Question

Hello,

When a post request is sent it always throws me an error, Could you please help me in trouble shooting the issue here.

Here is error,

{"error":{"code":"Request_BadRequest","message":"A value without a type name was found and no expected type is available. When the model is specified, each value in the payload must have a type which can be either specified in the payload, explicitly by the caller or implicitly inferred from the parent value.","innerError":{"date":"2021-01-25T23:33:52","request-id":"4c8a1cb3-49f5-4120-b146-e124e924a99c","client-request-id":"4c8a1cb3-49f5-4120-b146-e124e924a99c"}}}