PHP warning

When I/anyone submits a form i get the following error ,

Warning: mail() [function.mail]: Bad parameters to mail() function, mail not sent. in /home/content/72/10314672/html/setpforwardpak/wp-content/plugins/mj-contact-us/files/mj-class-process.php on line 246

plaese help..

http://ww.wp.xz.cn/extend/plugins/mj-contact-us/