how to create mesh for curve lines in LUSAS

hi friends,

i need a help, on how to creat mesh to my model. my model composed of 2 curve lines and 3 straight lines.

when i assign surcafe to the model to create the mesh, the warning came out , which saying the it is something to do with non planar surface and when i check in index, it say something to do with support surface. As far as i concer the meshing must be bounded by 4 lines, not 5 lines as mine. 

please any one help me on this..

thanks.

meizan