Cannot read file content. Please check that the uploaded file is CSV encoded.

Same thing happening to me. I import a .ics calendar into Thunderbird’s Lightning. Then I export this to a .csv file. The file looks fine to me, but this plugin doesn’t like it.

I am getting various errors in different attempts.

What I did was manually enter a set of events in event organiser, then I exported a csv file from that using the event organiser csv plugin.

I would get the following errors on different attempts when trying to re-import the updated csv file:

“Cannot read file content. Please check that the uploaded file is CSV encoded.”
In this case, I KNOW it is a CSV comma delimited file.

“The CSV file is invalid”

Again, CSV, comma delimited.

“Start date not provided.”
OK here it sees the first column, but nothing past the first comma beyond that first column. Why? When I check the file visually I see the commas, everything is there, but the importer doesn’t see it.

What gives? This is very perplexing.