Couldn't get ShowQ running

Hi! I've installed ShowQ, connected my laptop with a Yamaha 03D (audio) and a Jester Zero 88 lighting desk. When I tried to start the program i get the message: "Show Q could not connect to JACK." I clicked "OK" opened Qjackctl, clicked on "Start" and got the following message: "Fehler - JACK Audio Connection Kit D-BUS: SetParameterValue(driver:ignorehw','false'): Invalid container address 'driver':'ignorehw':'(null)' supplied to method 'SetParameterValue'... (org.jackaudio.Error.InvalidArgs)". The only option was "Abbrechen" (german for cancel, I think).

Next message: Fehler - JACK Audio Connection Kit D-BUS: SetParameterValue('driver:wordlength', '16'): Invalid container address 'driver':'wordlength':'(null)' supplied to method 'SetParameterValue'... (org.jackaudio.Error.InvalidArgs)". I clicked "cancel" again.

Next message: Fehler - JACK Audio Connection Kit D-BUS: JACK-Server konnte nicht gestartet werden. Tut mir leid.

Btw.: "Fehler" is german for error and "konnte nicht gestartet werden" means sth. like "couldn't get started." "Tut mir leid" means "I'm sorry".

Next message after I clicked "cancel" again:
Fehler - JACK Audio Connection Kit Keine Verbindungsaufnahme als client zum JACK-Server möglich. - Gesamtbetrieb schlug fehl. -Verbindungsaufnahme zum Server gescheitert. Bitte sehen Sie im Meldungsfenster nach weiteren Informationen.

Free amateur translation: Error - JACK Audio Connection Kit No connection to JACK-Server possible. - Whole thing failed. -Connection to server has failed. Please see message window for further informations.

Thanks in advance

Ralf