Errors when uploading XLS file to Kobo

I am a new user so i cannot upload a document here but can someone assist me with ideas in identifying the errors in an XLS form which shows errors when uploading to Kobo? I have already run the form here ODK - XLSForm Online and it’s ok but still cannot upload it. I will appreciate it.

Welcome to the community, @simon1! Maybe you will also need to share with the community a screenshot of your issue (that you get when deploying it to the server) so that we can also understand your issue pictorially.