Wrong format for email addresses when using distribution list

When I use a Distribution List to send an email I get the message “Recipients you entered into the To field have an incorrect format”. When I check there are just email addresses and no name as in individual emails. Why does eM Client not use the normal format?

Send me the problematic distribution list saved in .vcf format. Simply right click on it and choose Save as… Thank you.

wilson@emclient.com