Hi, This is annoying error reported by hundreds of Google Sheet users and until now still. I have tried different solutions and this one worked for me. I used =IMPORTDATA("https:yourwebsite.com/csv") instead of =IMPORTDATA("https://www.yourwebsite.com/csv"). Comment down if this works.
how-to /ˈhouˌto͞o/ INFORMAL adjective adjective: how-to; adjective: howto providing detailed and practical advice. "read a how-to book" noun noun: how-to; plural noun: how-tos; noun: howto; plural noun: howtos a book, video, or training session that provides practical advice. "a how-to on processing digital images" the correct procedures for a particular activity. "you will discover the how-tos of freehand drawing"