Getting error message "(string reference not set to an instance of a string. parameter name: s)"

[SARAN]

Hello Trekiel,

I tried the steps mentioned in this post by user "Trekiel" but, I am getting this error message (string reference not set to an instance of a string. parameter name: s). How to resolve on this.? 

[avillanueva · Accepted solution]

Sorry for missing your DM. I have experience with Excel to pull down these reports but now Power BI. Do you want to close out this post as I see you have another post about this same issue going with responses?