Suma de celdas en excel

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Screenshot of a debugging interface showing a section of code related to Excel file processing with a highlighted assignment operation and an error message indicating a null value. (Subtitulado por IA)
Screenshot of a debugging interface showing a section of code related to Excel file processing with a highlighted assignment operation and an error message indicating a null value. (Subtitulado por IA)1523×746 47.7 KB

sigo sin comprender, podrias darme mas detalles para poder realizadlo porfavor