I am trying to import leads using a csv file. I have First Name, Last Name , email address and Company Name fields only. When I import that csv, AC says that the file structure is correct but during the simulation it errors out.
Can you post a trace of the error log or error message that you get? Is this for a production instance? If so, I recommend that you contact tech support as it is going to be difficult to troubleshoot without access to the environment.