Error in getting control points for surface in UF_MODL_ask_bsurf

[WilsonBlr]

I am trying to get control points and other data for a NURBS surface. I am using the UF_MODL_ask_bsurf method.

UF_MODL_bsurface_p_t t_struc_info;

UF_CALL(UF_MODL_ask_bsurf(SurfId, t_struc_info));

I get the following error without any proper error message or error code.
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Failed to handle error condition correctly - exiting
General Fault Exception
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Has anybody come across this or is there a workaround for this ?