TYPO3 Core

Good morning TYPO3-Team,

I'm using TYPO3 9.5.4 and just have installed tt_address which results into an Exception while activating this extension. I have opened a new Tab to switch over to the Installtool and executed the Database Analyzer which results into this error:

Something went wrong. Please use Check for broken extensions to see if a loaded extension breaks this part of the install tool and unload it.

Below you have implemented a little result box for Ajax Errors which is extremely small (See picture). Of cause I can fade-in that window and fade-out it again, but after fade-out the window shrinks back again to a very small window.

Stefan