Visualizing wind rose from excel file

hello all,
i am facing an issue to visualize wind rose from one excel fine ( wind Direction and Wind Speed values).during a year.
i have for both Win direction and Wind Speed 8760 values in excel file
i got a error : 1. Please provide valid lists of hourly wind direction and hourly wind speed!

if i connect excel reader to create header LB , i got another error :1. Solution exception:invalid literal for float(): PF
can please please help me.
Thank you very much