If I understand correctly you are replacing ordinary switch with switch-plug-GFCI device.
And one cable enters the box, and the cable has 1 black and 1 white and 1 ground wire.
To correctly wire combo GFCI device, you need a Neutral wire.
If your switch box has 1 cable, then it does not have a Neutral.
The neutral is required for GFCI operation, and also to power new outlet.
To test for Neutral wire:
Separate wires for testing.
Turn power ON.
Test each wire to bare ground wire.
Tester lights up on Hot line wire from breaker box.
Hot is identified.
Test Hot wire to all other wires inside box, except bare ground wire.
Tester lights up on Neutral wire.
> If switch box does not have Neutral, then device cannot be wired correctly.
> If you do have a Neutral, then open following link for correct wiring of device:
http://www.fixya.com/support/t8269774-okay_same_problem_cooper
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