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RiskModelExposure Question

So....I ran my algorithm as a first attempt in using all the new contest methods in order to make sure they were working correctly. I had the RiskModelExposure working yesterday but now every time I go to run my algorithm, it returns nothing when I use the risk_loading_pipe(). I put breakpoints in and have received 2 different errors (only appears when I put in breakpoints and step down through the code).

Module 'experiment' is no part of quantopian.optimize (mainly what I've been getting recently
Broken pipe (risk_loading_pipe)

Not sure if the Quantopian crew has moved this out of experimental to some place else or something but it's really irritating me....