Whenever I try to use a bullet hole decal and create it on an object, I receive an error.

Here is my code: (It is similar to an example in the lite-c manual)

// calculate the target vector
VECTOR trace_target;
vec_set(trace_target,vector(5000,0,0)); // the weapon has a firing range of 5000 quants
vec_rotate(trace_target, camera.pan);
vec_add(trace_target, camera.x);

// display a red spot at the target position
if (c_trace(camera.x,trace_target, IGNORE_PASSABLE | USE_POLYGON| SCAN_TEXTURE) > 0) // hit something?
draw_point3d(hit.x,vector(50,50,255),100,3);

// fire and then place a decal at the hit position
if (key_ctrl) // fire
{
PARTICLE* p = ent_decal(you,bmMark,you.x, you.y); // place a random sized decal at the hit entity
p.lifespan = 80;
wait(-0.5); // reload
}

What is wrong with the code?

Also, does anyone know how to make a bullet hole decal on the object more easily?

Well, I think ent_decal only work on Commercial version and above

But that you pointer in

could be NULL and that will generate error..(No such thing as NULL.x)

How about using

... im using a png 64x64 and this crashes, the only way to not crash is using p.material=NULL; but that will make the texture square black?

Setting the material to null is not a good idea. PNG is even not the greatest idea. You should use .bmp, .tga or .dds. What exactly is the error message you're getting?

well i was just "drunk" i did this:

PARTICLE* p= ent_decal(you,"d_map.png",0,0); // place a random sized decal at the hit

of course i have to define the BMAP first.. or use the bmap_create..

Anyway PNG always work 5 stars for me!

Now the only problem is that the texture is not wrapping very good to the surface, sometimes it gets bigger others smaller dependning on the face of the sphere .. (dont know why..)
Gs never is perfect..