Function bless_session 

pub fn bless_session<G: GameData>(
    start: Start<G>,
    text: &str,
) -> Result<String, String>

The session record in text made again from start: every frame played, differences and all, and recorded. The same inputs, this build’s stamp and hashes. The error says why it can’t be played, or that this build reads the platform differently, so its inputs are no longer the record’s.