[Solved] Shader Error ?

I put a mesh on the other mesh , and set the edge soft blend:
it is perfect


but when i put it on the ETM's terrain, a transparent outline will appear:


i think it is ETM's material error, it using shader material,
am i right ? how to do?

i found that i was caused by the lightmap,
delete this in ETMMaterial:

texture_unit
{
// dynamically created
// texture ETLightmap
}

but now no light, how to do?