Negative Voltage output by MP1423

I want to build a application for 12Vin conver to -5Vout/1A.
I use MP1423 and made a circuitry as attachment ( data sheet included).
The original Vout was changed as GND, and original GND was changed as -Vout, Can it work ?
Is there any risk under operarting?
What else need to watch ? Thanks