[simracingsystem]

Ac launcherdata folder in my docs needs to be deleted from time to time, otherwise some errors may occur.
This could be one of them.

if after deleting that folder, you launch AC launcher, register on a session and after the 05:00 you press "please wait" and it quits the session, I suggest a steam file check.

[Fran Tenreiro]

This happened to me a couple of times too. I hitted by mistake the "please wait" button and send me out