Question: Error in executing my function

Hi every one

I'm new to maple programming so my question might be boring. I'm trying to solve the higher order kernel generation function which appears in B. Hansen (Econometric Theory, 2005). The quation is

When I tried to execute it, the follwing error appears

Error, (in hypergeom/check_parameters) function doesn't exist: found the number 0 in the second list of parameters.

I tried my best to solve this problem but I failed. This equation is well known and used in many papers so I don thik there is anything might leads it to give an error. So, what did I do wrong and how ca I fix it??!!!

Please, Heeeeeeeeeelp I need it.

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