The message "Failed to load il2cpp" appears, and the game won't start. (Steam)

First, make sure that your game has been updated to the latest version.

If this issue is still occurring on the latest version, conducting a Steam Game File Integrity Verification may resolve the issue. Please refer to the instructions below to try it.

■ Steam Support - Verify Integrity of Game Files
https://help.steampowered.com/en/faqs/view/0C48-FCBD-DA71-93EB

If you do not have the latest version of the game, please try updating the game as well.