Item Updating event handler in Forms Library throws Error message Forms instead of a web page

Hi All,

     I have an Item updatiing event handler on a form library. When any validation is done throws the error message on forms instead of throwing it in a new page. 

When any field is updated with a value, it picks up the value updated for the first time not the value update after the close button is clicked.

For eg: I fill in the form and save it. When I reopen that form and update it, there is some validation happening. Any value which is not correct throws an error in forms itself. I change the value and update it still gets the value which I entered first and throws the same error.

I don't understand whats happening?

Thanks In advance,

Prasad