Er- that error usually just means that another program is using your scenario file. Make sure Halo, sapien, and everything except tool are closed. If you have to, restart your computer and run tool before running anything else. That will probably fix the error.
Edit: And if sapien is giving you that error, make sure the other tools are closed. I've also found that halocedev.exe will sometimes cause that error. Not sure why. So try closing any open dev tools/hacks as well.
Seriously, we should have an "annoying tool errors" sticky thread right under the tutorial sticky. I'll write it if nobody else wants to.
Edit edit: thread is up and stickied fyi.
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