For an import to work, mandatory fields must be mapped correctly. It is recommended to include as much data per roster member as you can, but a name and email address are the only mandatory fields. For youth leagues an email is not required for the player, only their contacts.
Here is an example of correctly mapped fields:
If a mandatory field is skipped, the import will fail.
Having troubles with your import? Email the file to firstname.lastname@example.org and we will have a look!