I get "We could not fetch the requested data. This may not be valid data, or a failed download of custom data. Skipping source (/QuantConnect.Live/data/alternative/cboe/vix.csv)."

this is my code

from QuantConnect.Data.Custom.CBOE import *

class QuantumDynamicAutosequencers(QCAlgorithm):

def Initialize(self):
#intilizing code
self.cboeVix = self.AddData(CBOE, "VIX").Symbol
def OnData(self, data):
'''OnData event is the primary entry point for your algorithm. Each new data point will be pumped in here.
Arguments:
data: Slice object keyed by symbol containing the stock data
'''

if(data.HasData) :
if data.ContainsKey(self.cboeVix):
#do code