Some Unexpected Behaviour.Help me on this

[eluser]Unknown[/eluser]
Dear friends,

I am newbie to codeigniter. i have to do this site which was already developed by another programmer and i am working as a fresher in codeigniter.
I have this URL showing some issues.

http://eurekaholidays.co.za/accomodate/request_quote/47

if i click the submit button ,in the bottom right without filling the text fields, it shows the validation messages which is quite ok

Now if i am pressing the ENTER key in the URL area of browser (NO REFRESHING) it shows PHP ERROR encountered in all area of the site.

Can you suggest the possible solutions for this.


Regards,
Shanavas