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Pipeline not working with Contract Win dataset

It's been a while since I've been on quantopian and I'm relearning things so this is probably a no brainer,but I can't get the contract win dataset to work in my notebook (attached).

My attempt is just to filter down to the QTradableStocksUS that also have had a contract win over the time period (which I've defined as contract_win_amount > 0).

In doing so, I get the error "TypeError: zipline.pipeline.pipeline.init() expected a value of type zipline.pipeline.filters.filter.Filter or NoneType for argument 'screen', but got blaze.expr.arithmetic.Gt instead."

Anyone know what I'm doing wrong?