class ExistingAuctionException(Exception):
    pass


class AuctionException(Exception):
    pass


class UserException(Exception):
    pass


class CategoryException(Exception):
    pass


class BidException(Exception):
    pass


class PriceException(Exception):
    pass


class SessionException(Exception):
    pass

class ExistingAuctionException(Exception):
    pass


class AuctionException(Exception):
    pass


class UserException(Exception):
    pass


class CategoryException(Exception):
    pass


class BidException(Exception):
    pass


class PriceException(Exception):
    pass


class SessionException(Exception):
    pass
