Unable to read excel file with openpyxl

I am trying to open an excel archive but i couldn't do it:

import openpyxl
doc = openpyxl.load_workbook ("C:/Users/administra/Datos_Campo_El_Mirador.xlsx")

Output: ValueError: min() arg is an empty sequence

I try again changing ashes

import openpyxl
doc = openpyxl.load_workbook ("C:/Users/administra/Datos_Campo_El_Mirador.xlsx")

The same error (ValueError: min() arg is an empty sequence)

Thank you very much