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Only SPY works in algorithim

I have an algorithim that is working well. I tried changing from SPY to any other symbol, IWM, QQQ MSFT etc..and I'm getting This asset symbol ( ) was not found in your security list. Please add this security or check it exists before using it with 'Securities.ContainsKey(" ")'.

self.equity = ["SPY"]
self.AddEquity(self.equity[0], Resolution.Hour)                                                              
self.Securities[self.equity[0]].SetLeverage(1.5)

Not sure why changing SPY to any other symbol doesn't work.

Thanks 

Update Backtest







The reason for this could be because a string is being added into self.Securities as opposed to the Symbol object. Securities is a Dictionary<Symbol, Security> and in the line self.equity[0] is a string:

self.Securities[self.equity[0]].SetLeverage(1.5)

If this is not the case, it would be helpful to attach a backtest so we can more accurately determine the problem.

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