AI2 companion does not connect anymore

all worked a few month back.
android OS13. companion 2.73a.
i got simple a white screen when scanning the QR code. it used to work. so i uninstalled the companion app and reinstalled and now get error

unable to load extensions.java.lang.StringIndexOutOfBoundsExxception: start 1, end 0, ,length 0 ...
what to do?

ups. just tried again - this error is gone but i still get only blank screen and not my project when scanning the QR code

thanks
erhard

Try the bugfix companion:

Select "Not now" when/if asked

ok still get empty screen - sorry

it opens as 2.73t6u