How to Get GUI Working

i have mycroft-gui and the new mint 20. installation succes but i become this error.

qt5ct: using qt5ct plugin
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
qrc:/main.qml:37:5: Unable to assign [undefined] to int
qrc:/main.qml:36:5: Unable to assign [undefined] to int
qrc:/main.qml:35:5: Unable to assign [undefined] to int
qrc:/main.qml:34:5: Unable to assign [undefined] to int
qrc:/main.qml:33:5: Unable to assign [undefined] to int
qrc:/main.qml:32:5: Unable to assign [undefined] to int
qrc:/main.qml:214:17: Unable to assign null to QStringList
qml: Trying to connect to Mycroft
Bereits aktuell.
Starting all mycroft-core services
Initializing…
Starting background service bus
CAUTION: The Mycroft bus is an open websocket with no built-in security
measures. You are responsible for protecting the local port
8181 with a firewall as appropriate.
Starting background service skills
Starting background service audio
Starting background service voice
Starting background service enclosure
Main Socket connected, trying to connect gui
Received port 18181 for gui “{42ca529b-e900-4bbd-beed-32c9b8977928}”
qrc:/main.qml:257: TypeError: Cannot read property ‘longDuration’ of undefined