i am trying to import leads into my crm and none of them are being imported

i am trying to import leads into my crm and none of them are being imported

i have lists that i am trying to import into the crm and when i upload them i map all the appropriate fields then when i import they are not being imported and it is giving me this error:  (Reason: Due to empty values for any of the mandatory fields) .  I have checked the fileds and  all of the values are there. Can someone help me with this?