
class UnitError(Exception):
	'''Unit Error'''
	pass

class UnitExecutionError(UnitError):
	'''Unit Execution Error'''
	pass

class UnitOutputError(UnitError):
	'''Unit Output Error'''
	pass



class UnitError(Exception):
    '''Unit Error'''
    pass

class UnitExecutionError(UnitError):
    '''Unit Execution Error'''
    pass

class UnitOutputError(UnitError):
    '''Unit Output Error'''
    pass


Improve formatting of errors