Invalid User error when add new user

Login as an admin. Navigate to " Site administration / Users / Accounts / User profile fields " Under " Create a new profile field ", select " Text input " Enter a " Short name " and " Name " for the new profile field. Save the changes. Navigate to " Site administration / Users / Accounts / Add a new user " Confirm that the form loads correctly. Fill out the form to add the new user's details. Save the changes. Confirm that the new user has been successfully created. Edit the user's profile and save the changes. Confirm that the user's details are successfully updated.