Structure of BadRequest error should have Message set

pkg/api/errors/errors.go

@@ -151,11 +151,7 @@ func NewBadRequest(reason string) error {
 		Status:  api.StatusFailure,
 		Code:    http.StatusBadRequest,
 		Reason:  api.StatusReasonBadRequest,
-		Details: &api.StatusDetails{
+		Message: reason,
-			Causes: []api.StatusCause{
-				{Message: reason},
-			},
-		},
 	}}
 }