Importing contacts via Migration Wizard - Unable to add

Importing contacts via Migration Wizard - Unable to add

I have just purchased Zoho Mail Lite, and am migrating my information using the migration wizard.
It appears to be having an issue when it tries to import contacts and I've narrowed it down to the fact that my contacts don't all have email addresses.
Those that do, have successfully migrated. Those that don't, haven't.

This appears to be an error - I have a number of contacts which I only call and text, I don't always email. Can you please advise what the resolution here is?

Thanks