Failed to start a QT6-Quick application in kdevelop (error with plasmoidviewer)

Hi,

I installed kdevelop and create a new qt6-quick-application. No errors during build but I can not execute the app within kdevelop. I get an error from plasmoidviewer:

/tmp> -a
*** Fehlgeschlagen *** (en: failed)

I am on openSUSE Tumbleweed.

Best regards
Kay