When trying to import the data unit, it is stating that there is no account name, There isn;t in the csv file it has asked me to import. How can I move forward? Thanks

When i am trying to complete the challenge, It asks me to Create an object with 'Campsite' as the Label and Object Name. The object must have the resulting API name of 'Campsite__c'.
When i am trying to action this the following error applies. If i try to submit with one underscore the challenge says it cannot locate it.

Error: The Object Name field can only contain underscores and alphanumeric characters. It must be unique, begin with a letter, not include spaces, not end with an underscore, and not contain two consecutive underscores.