make erorr more explicit (#515)

* make erorr more explicit

* change error message

pkg/cmd/push/cmd.go

@@ -118,7 +118,7 @@ func runCommand(opts *pushOptions) func(*cobra.Command, []string) error {
 		output.Infof("Pushing %s", opts.modelRef.String())
 		desc, err := PushModel(cmd.Context(), localRepo, remoteRepo, opts)
 		if err != nil {
-			return output.Fatalf("Failed to push: %s", err)
+			return output.Fatalf("Failed to push: %s. Check you have write permissions to the organization and repository you are pushing to.", err)
 		}
 		output.Infof("Pushed %s", desc.Digest)
 		return nil