3818035 - Employee Import Error: "The login ID username@domain.com is already being used by another company. Modify the login ID for the employee "?name, name ?" with employee ID [XXXXX ] in your employee import feed file"

I have received the error "The login ID username@domain.com is already being used by another company. Modify the login ID for the employee "?name, name ?" with employee ID [XXXXX ] in your employee import feed file" in the Employee Extract to Travel job.  How do I correct the error?

Unable to add a new user , KBA , CON-CA-ADM-USR , User Administration , CON-CA-TLS-IEM , Import / Extract Monitor , Problem