Error by sending, but switching is done

Hi
when i send the payload to the mystrom switch, every command getting error's in the log:

`<html>
<body>


node-red.0 | 2022-03-14 19:44:13.994 | error | 14 Mar 19:44:13 - [error] [myStrom Switch:Küche ON] An error occured while sending
-- | -- | -- | --



</body>
</html>`

thanks for help
pat