Uh.. are you sure you're on the correct page for the game you're trying to open? That error message is not related to CH. CH neither uses RenPy 8.1.3 (it uses RenPy 7.5.3) nor is there a folder called "music" with a file called "Tranquil.ogg".
From what I can tell, it's a CoR (Champion of Realms) error message, given the name (Zimon) in the file paths. You might want to check out CoR's page and ask there for help.