Finally I fixed the problems of Open edges, etc when i use the tool model command. Now to make my collision-geometry i have a new error in tool:

### cabaħa_collision.jms
### ERROR found z buffered triangles (red).
### ERROR couldn't build bsp because of overlapping surfaces (orange).
### ERROR couldn't build bsp2d.
### ERROR couldn't build leaf.
### ERROR failed to import collision bsp.
### ERROR couldn't import permutation 'cabaħa_collision' of node 'frame'.
### ERROR failed to import collision model 'cabaħa\cabaħa'.

NOTE: The original name is "cabaña" (Im mexican)

How i can fix this?! DON´T TELL ME ABOUT IMPORTING THE .WRL FILE because tool doesnt create the .wrl file in my directory. I used STL Chek and i don´t have errors. PLEASE HELP THANKS!

Try not using characters such as "ñ"
Only use standard keyboard characters. If you have to use alt anything then it most likely will not work great within console.

Z-buffered triangles means you have faces intersecting other faces, but they are not welded or joined at the point of intersection (I think. I could be wrong.). Overlapping faces could be referring to your Z-buffered problem, or it could simply mean you have some faces that are on top of one another. This could be fixed by welding vertices to a low threshold, assuming that the overlapping face is not attached to the mesh.

Z-buffered triangles are fine to have. They don't affect the process at all usually.
It's the orange that's killing it. There are multiple faces in the same place. Find where that is and fix.