Func_brush tied to saw blade

If you were to shoot a saw (models/props_junk/sawblade001a.mdl) into a wall with the gravity gun, you would not be able to jump on top of it. I tied a func_brush to the saw so that it would correct this. Func_physbox gave odd results so func_brush was used. Now, on the surface, it works as planned, but in the console I get this error:

Changing collision rules within a callback is likely to cause crashes!
Changing collision rules within a callback is likely to cause crashes!
Changing collision rules within a callback is likely to cause crashes!
Changing collision rules within a callback is likely to cause crashes!
Changing collision rules within a callback is likely to cause crashes!
Changing collision rules within a callback is likely to cause crashes!
Changing collision rules within a callback is likely to cause crashes!

Seriously, I get it that many times for firing it once into the wall. The reason I'm trying to do this is for a puzzle. Any help would be great.

I get the same messages with my crystal props. As far as I know, it has something to do with the stick-in-the-wall behaviour rather than the attached func_brush. So far, they haven't caused any crashes or odd behaviour, so I wouldn't worry about it.

What I would keep in mind, though, is that no player could stand on sawblades in HL2, so they're likely to assume the same for your map...

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Create-ivity - a game development blog

I get the same messages with my crystal props. As far as I know, it has something to do with the stick-in-the-wall behaviour rather than the attached func_brush. So far, they haven't caused any crashes or odd behaviour, so I wouldn't worry about it.

Okay. I was worried about the map crashing for somebody.

What I would keep in mind, though, is that no player could stand on sawblades in HL2, so they're likely to assume the same for your map...

I thought about this. I'm trying to create this climbing puzzle thingy, and I thought saw blades would make the most sense to stick into the wall and climb up. Maybe I should rethink it.. or tell people they can jump on the blades? I don't know.

If you tell or show players these objects can be stood on, then you'd have to create a puzzle where finding out isn't the trick but smart use of these object is.

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Create-ivity - a game development blog

Yeah, that's the idea.
It was a taller room, and the player would have to use the saw blades to climb up to the top for an RPG or something.