Launch Failed. Binary not found. CDT on Eclipse Helios

I'm using Eclipse Helios on Ubuntu 10.04, and I'm trying to install CDT plugin on it. I download it from here here.

And then I go to Install New Software and select the zip file (I don't extract it, just select the zip file). And its ok, it installs, everything works fine, it shows optional features, blah blah blah.

And then I create a new HelloWorld project. And when I try to run it, it shows an error and says:

Launch failed. Binary not found.

Can anyone explain me how to fix it?

Thanks.