The upload directory is not writable: uploads won't work in your form.
Use your FTP software to set the permission to 755 on the directory cfg-contactform-3/upload to solve this problem.
Set the permission to 777 if it does not work otherwise. If your website is installed on a Windows based server, you must make the directory writable.
If there is no upload directory inside the cfg-contactform-3 folder, use your FTP software to create it and set it with the permissions mentionned above (755 or 777).