Neos 9 Javascript Error

[MarcoPNS]

Hi,
After installing the package on my Neos 9 instance, I received an JS error, which prevented the Neos backend from loading. The backend is accessible again after it has been removed again. Here is the error:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading '$get')
    at getRichtextToolbarConfig (Plugin.js?bust=be304090:26:6902)
    at Plugin.js?bust=be304090:26:978
    at Array.forEach (<anonymous>)
    at Plugin.js?bust=be304090:26:866
    at index.js:91:35
    at Array.forEach (<anonymous>)
    at zPn (index.js:91:10)
    at HTMLDocument.PPn (index.js:59:5)

I have neos-ui-compiled v9.0.1 and neos-simple-editor-extend v3.2.0 installed.