Trying to backtest a simple breakout strategy from Following the Trend (Clenow): https://www.dropbox.com/s/y038hdw6deukqpo/Screenshot%202015-04-30%2021.16.13.png?dl=0

Received a runtime error: https://www.dropbox.com/s/4xhwzoomyu59f6n/Screenshot%202015-04-30%2021.17.05.png?dl=0

Is this an error in my algorithm? I have pieced it together / modified the Bitcoin and Moving Average tutorials to get the overall structure. Not sure where to dig deeper to find the source; would appreciate some input.