Invalid Data Type Due to blanks

Could someone please assist me with writing the following function? I have tried plugging in IFERROR but it keeps throwing back an error, likely because I am not writing it correctly. The Start Date will sometimes be blank, and I am tracking the frequency of each Request Type for a month over month report, (eventually year over year) therefore, I need the include the Month and Year.

=COUNTIFS([Request Type]:[Request Type], "Documentation", [Start Date]:[Start Date], YEAR(@cell) = 2020, [Start Date]:[Start Date], MONTH(@cell) = 11)

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