Error: "Cannot get managed object

Hello, so I'm pretty new here but so far I like what I see quite a bit, however I'm having trouble figuring out how the framework works.

I'm currently trying to implement a rotational etf strategy, however I keep getting this erro that I have no idea how to deal with:

Runtime Error: TypeError : Cannot get managed object
at OnData in 34
TypeError : Cannot get managed object

I simply have no idea what this means. What is the managed object in question?
What's really strange is that even when I change my code around to simply add spaces around line 34, it still tells me that the error is on line 34 even if line 34 is blank.

Here is my code so far. Any help would be greatly appreciated.Thanks in advance!

import numpy as np

class RegionalETFrotationAlgorithm(QCAlgorithm):

def Initialize(self):

self.SetStartDate(2013,10, 7) #Set Start Date
self.SetEndDate(2013,10,11) #Set End Date
self.SetCash(100000) #Set Strategy Cash
# Find more symbols here:
self.tickers = ["MDY", "IEV", "EEM", "ILF", "EPP"]
self.AddEquity("EDV", Resolution.Daily)
self.AddEquity("SPY", Resolution.Daily)
self.growth = []
for ticker in self.tickers:
self.AddEquity(ticker, Resolution.Daily)
dictionary = {"symbol":ticker, "momentum":self.MOMP(ticker,90, Resolution.Daily) }

def OnData(self, data):

for ticker in self.tickers:
dictionary = {"symbol":ticker, "momentum":self.MOMP(ticker,90, Resolution.Daily) }

bestEtf = self.bestEtf()
if bestEtf['momentum'] > 0:
if self.Portfolio.Invested:
self.SetHoldings(bestEtf['symbol'], 1)
if self.Portfolio.Invested:
self.SetHoldings("EDV", 1)

def bestEtf(self):
current = self.growth

while len(current)>1:
if current[0]['momentum'] >= current[1]['momentum']:
del current[1]
del current[0]
return current[0]

Update Backtest

Unfortunately, I was not able to replicate the error you've been receiving. When taking the copying and trying to run the algorithm I ran into many other issues as well. I recommend looking at this sample code that implements an ETF Global Rotation algorithm. It seems to be very similar to what is being attempted and the code will provide you with good structure. Two notable issues are that Liquidate is a property of QCAlgorithm so the proper line method call should be self.Liquidate(), and self.Portfolio is a dictionary so in order to use .Invested, a symbol needs to be called i.e. self.Portfolio["IBM"].Invested.


Thank you very much. I figured out all the issues and got it working. The issue was that it was returning the MOMP type rather than an integer, so I had to return the integer by using MOMP.Current.Value.


Update Backtest


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