Copy-paste fix pattern
library CB-Storage
fn main() {
CB-Storage.write_text("player.cb", "100")
u256 coins = parse_u256_or(CB-Storage.read_text_or("player.cb", "0"), zero)
save coins
}Why it happens
A .cb file failed validation or no longer matches the ClosedBit storage format.
How to fix it
Recreate the save through CB-Storage or restore a valid .cb file.
Runtime and Studio now show this kind of page from the error dialog: plain message first, stable code second, original details third.