I created a connectmodule for converting logic to electrical. I have code of the following kind:
----------------------------
reg a;
always @ (b)
  a = b;
xyz xyz_inst (
          .a_e(a));
-----------------------------
here the module xyz expected an input of type electrical. However, during ncelab I got the following error:

No connection driver found for this net.
NCelab points at the IN port for this error. Any help on debugging this error would be very useful.
Thanks
Tushit