I still have this issue in v1.11.1.1 #02
It only occurs if you do not have the actual version of the modpack.
A window occurs (after starting the game) whith the option "download new version" or "ignore".
If you click "ignore" the erroro occurs (endless "Updating the garage") and you have to restart the game.
There is a workaround by clicking "download". Than, you can proceed normally to the garage