text: class TreeNotInitilized(Exception):
  	def __init__(self, *args, **kwargs):
  		"""
  		PS.: Add a message to be printed out as positional argumento or name it 'msg='.
  		"""
  		msg = "Missing Tree Inilialization"
  		if 'msg' in kwargs:
  			args = ("{}: {}".format(msg, kwargs['msg']),)
  		elif args:
  			args = ("{}: {}".format(msg, args[0]),)
  		else:
  			args = (msg,)
  		Exception.__init__(self, *args)
  
  class PackageNotOnTree(Exception):
  	def __init__(self, *args, **kwargs):
  		"""
  		PS.: Add a message to be printed out as positional argumento or name it 'msg='.
  		"""
  		msg = "Package not existent in dependency tree"
  		if 'msg' in kwargs:
  			args = ("{}: {}".format(msg, kwargs['msg']),)
  		elif args:
  			args = ("{}: {}".format(msg, args[0]),)
  		else:
  			args = (msg,)
  		Exception.__init__(self, *args)
  