Splitting of existing mesh on a source face is not implemented
 

Dear All,
As the name suggests, while meshing a volume with Cooper method (interval count = 50), I am getting this error : Splitting of existing mesh on a source face is not implemented

I am following the following procedure:
1. Making the geometry.
2. Making boundary layers on faces.
3. Attaching meshes to the faces.
4. Trying to mesh the volume bounded by the the 6 surfaces (3 of those surfaces are used as source faces)

The error occurs for one source face. Please help!
Thank you!