Bad arguments to is list empty



I created an app to search data from Google Sheets, but it shows an error when I download and use it. Could you help me identify the cause?

Run the script url in browser and you will come to know the error. Instead to return data it returns error. If you use one more condition like response code is 200 then try to parse the list. If the code is not 200 then it is encounter an error

Taifun