class CompilerError(Exception):
    pass

class UnsatError(Exception):
    pass

class NoContractFoundError(Exception):
    pass
class MythrilBaseException(Exception): pass

class CompilerError(MythrilBaseException): pass

class UnsatError(MythrilBaseException): pass

class NoContractFoundError(MythrilBaseException): pass

class CriticalError(MythrilBaseException): pass

build exception hierarchy from MythrilBaseException