It is due to the mismatched files-
You should try these basic methods to get the solution-
You must check your internet connection and make sure it is stable.
Verify the game files through Steam to ensure that all necessary game files are present.
Try restarting your computer and launching the game again.
If still it is showing the same issue then you should contact Steam support or the game's developer for assistance. They may be able to provide further troubleshooting steps or a fix for the issue.
Thanks