Adding Vertices(in list) to and Object.

[LiveWire]

take a look at:

List *VertList;
for(loop...)
{
    Vertex *temp_vert = new_vertex_set(x, y, z);
    list_add_item(&VertexList, temp_vert);
}
object_add_vertices(return_Object, VertexList);

it always brings up the error:

Exception occured in command load_file_select.
Last Error(not necessarily the problem): The operation completed successfully.

but it works when i use:

for(loop...)
{
    Vertex *temp_vert = new_vertex_set(x, y, z);
    object_add_vertex(return_Object, temp_vert);
}

im trying to get my code to run faster.
any help?
--Phil