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TypeError:MaximizeAlpha() expected a value with dtype 'float64' or 'int64' for argument 'alphas', but got 'object' instead.

Hi Quantopians,

I would be really grateful to anyone that can rectify this error as I am new to python (just started a few days ago) and can't really understand the previous posts on this related issue. In addition, I hope that you guys can drop some advice for me to be a better programmer too!

Thank you :)