Linked CSV file, date format error, #Num! ...

OT Hrs: IIf([Production Details]![Depositing Qty Overtime]<30,"0",Round(([Production Details]![End Time]-[Production Details]![End Work])*24,2))

The result was show properly. But when I used it the OT Hrs to multiply the OT quantity. The answer correctly calculation execpt the OT value was 0. The error show as #Num!.

Anyone could help for this? Thanks in advance.
 

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