ncdfvdfcreate excluding vars

I'm trying to convert an netCDF file to vdf. My variable (b) varies in x,y,z, and t. When I use "ncdfvdfcreate -dims 64x64x1 -vars b -vars3d b -numts 10 -timedims t -timevars t -extents -1:-1:0:1:1:1 test.nc test.vdf" I get this output: Created VDF file: Num time steps : 10 3D Variable names : 2DXY Variable names : 2DXZ Variable names : 2DYZ Variable names : Excluded 3D Variable names : b Excluded 2D Variable names : Coordinate extents : -1 -1 0 1 1 1 I'm not sure this is a problem, but when I then use "ncdf2vdf -vars b -numts 10 -timedims t test.nc test.vdf", I get an error: Invalid variable type Failed to open VDC variable "b" at time step... Any help would be appreciated!