I am working Map Client Relationships FInancialforce Challenge. I got this error below. I have no idea of what that is. Please advise!

Challenge not yet complete in Financialforce

There was an unhandled exception. Please reference ID: NTXGGCZR. Error: Restforce::ErrorCode::InvalidField. Message: INVALID_FIELD: Select Id FROM Account WHERE FirstName = 'Claire' AND LastName ^ ERROR at Row:1:Column:30 No such column 'FirstName' on entity 'Account'. If you are attempting to use a custom field, be sure to append the '__c' after the custom field name. Please reference your WSDL or the describe call for the appropriate names.

https://trailhead.salesforce.com/en/content/learn/modules/client-management-with-financial-services-cloud/map-client-relationships?trail_id=learn-to-work-in-financial-services-cloud&trailmix_creator_id=achouhabi&trailmix_slug=get-to-know-financialforce