im doing the Reports & Dashboards Specialist superbadge, im stuck on the first part where you have to 
Import survey and opportunity data into salesforce. i have imported the accounts, Opportunities and contacts but for some reason the account name isn't showing up in the contacts tab next to the name. im using dataloader but i have tried data import wizards but that didn't do a good job. on dataloder when you are mapping the fields there is no account name, so i searched up and says use accountid but that doesn't work  and fails to upload the data from the spreadsheet. the error is "Account ID: id value of incorrect type: Acestrip Sports" has this error for every one but different companies. How would i fix this?

thanks to who ever helps