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Futures data problems

Hello, I am trying to backtest my futures trading models and am having some serious problems with some of the assets. The corn data is just plain wrong and a lot of assets (such as Soybeans and oats) return this 'zipline.assets.continuous_futures.ContinuousFuture' object has no attribute 'log' when I try to do calculations. How can I fix these issues? Are there any other places to backtest on that will be more consistent?