i have a problem of fatal error during the work in houdini so many times plz any body tell me how i can fix his error i m working in version 9

You haven't provided near enough information.
What OS?
What graphics cards?
What version of Houdini?

Based on the image I'd guess your graphics drivers are not behaving well, but that's a guess.

Submit the crash report to Support.

It happened to me before. As I got a new video card, it didn't happen again so far.

You may delete your houdini preference files, and it may solve the problem.

The Pref. folder is located at “My Documents” folder.

Good Luck~

Tojam

it could also be something specific that you did just before the crash.

If it consistently crashes everytime you perform certain operations, be sure to let us know how we can make it happen as well.