Dear Beatriz,

Thanks again for your prompt response.

I change my data and I can create two output, 
1) Output Para Mesh.vtk 
2) Output Surface Mesh.vtk

I want to open them in 3D slicer, but I can't.
Please help me, how can see output file in 3D slicer ?
I can not see it on itksnap.

Please guide me.

Thanks.