Hi,

I've been rewriting an algo i wrote on quantopian and am running into some trouble.

When calling the SetBenchmark fucntion I am attempting to subtract the previous day's minute prices of the symbol[UA] from the previous day's minute prices of the symbol[UAA]. Then find the mean of those differences.

However, when i run the code below I get this error:

TypeError : unsupported operand type(s) for -: '1,

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