Samira,
I discussed this here A propos google sheet - #12 by Samira_kh
I believe the error is you set up your spreadsheet link inappropriately as I show in the above link. The theCSV is probably being set to an empty value. Why is an empty theCSV causing a problem? It is causing a problem because thePhoneList is created from the theCSV. Since theCSV is empty, you see the error Attempt to get item number 2 of a list of length 0. If you do a DoIt of theCSV, you should find that variable is empty.
Sorry, one of the PU's made this explanation difficult by splitting the topic. He didn't need too. I think he does not understand the problem is part of your previous question and the problem is related to using a LocationSensor.CurrentAddress and a Get to provide the phone numbers from different wilayas.
Does this explanation help?