class UnknownKeyError(Exception):
    def __init__(self, message: str) -> None:
        self.message = message

    def __str__(self) -> str:
        return str(self.message)


class SchemaTypeError(Exception):
    def __init__(self, message: str) -> None:
        self.message = message

    def __str__(self) -> str:
        return str(self.message)


class IdDoesNotExistError(Exception):
    def __init__(self, message: str) -> None:
        self.message = message

    def __str__(self) -> str:
        return str(self.message)