Need help with splines

My splines don’t show any materials asignes to the mesh i’m using on the spline, It displays a message saying the material didn’t allow the automatic configuration of “BUsedWithSplineMeshes” and that It Will show instead the world grid texture, I tried this in other maps and didn’t happening but I think it may be something related to the Landscape size, because the message appeared in two of my maps which have a large Landscape, but sincerely I don’t know and I need to fix it since the players can’t also see the textures of the spline