Session_start is causing problems

I spent a huge amount of time making a site, when I went to login to the admin panel.

I this error

**Warning**:  session_start() [[function.session-start](]: Cannot send session cache limiter - headers already sent (output started at /home/designs1/public_html/ in **/home/designs1/public_html/** on line **8

**can anyone help me…, if I cant be helped I might aswell just start over :frowning: