Irrlicht Engine

Ok, firstly a want to add only terrain. In the function
void CGameStateLevel01::Init(CGameManager* pManager)

I add

// add terrain scene node

scene::ITerrainSceneNode* terrain = smgr>addTerrainSceneNode( "media/terrain-heightmap.bmp");
terrain->setScale(core::vector3df(40, 4.4f, 40));
terrain ...

I have some question. I want to create the terrain and use the grassnode at my GameStateLevel.cpp

I can do it on my another file, not irrwizard, but whden I do the same thing at Irrwizard I can;t copile the files

Ok i see my new weapon. But when i shoot twice, the game crach, I can't shoot anymore; change the weapon.

Firsty I set the new weapon from Quake 2, I only copy files to media directory and change the name of source in gameweaponmanager.cpp

Maybe I'am doing some terrible bugs

Two questions. I use IrrWizard so I ask them in this topic.

1) I have problem with adding new weapon. I want to use basic gun from quake 2, but when I add it, i can't see ( when I set it to my enemy, everything is ok). I can't change to good position :(

And when i set it, and shot, the game crash ...