E0048: ABI Method Not Found

A method call was attempted on a narrowed ABI variable, but the ABI does not declare a method with that name.

Example (error)

abi MyAbi {
    fn transfer(amount: i64) -> bool;
}

fn test(x: Utxo) {
    if x is MyAbi {
        x.unknown_method();  // Error: MyAbi has no method named unknown_method
    }
}

Fix

Use a method declared in the ABI:

fn test(x: Utxo) {
    if x is MyAbi {
        x.transfer(100);  // OK
    }
}