There are no commands defined in the "notifynder:create" namespace.

[Wuxiaoyong198386]

There are no commands defined in the "notifynder:create" namespace.

[Gummibeer]

Which command do you expect? We don't have any commands in this package https://github.com/fenos/Notifynder/tree/master/src/Notifynder
So this exception message is 100% valid.