Getting error ORPSIM-16363 while simulating memrsitor model

.SUBCKT memristor Plus Minus 
.PARAMS Ron=1K Roff=100K Rinit=80K D=10N uv=10F p=1

Gx 0 x value={ I(Emem)*uv*Ron/D^2*f(V(x),p)}
Cx x 0 1 IC={(Roff-Rinit)/(Roff-Ron)}
Raux x 0 1G


Emem Plus aux value={-I(Emem)*V(x)*(Roff-Ron)}
Roff aux Minus {Roff}

.func f(x,p)={1-(2*x-1)^(2*p)}
.ENDS

but after running the simulation i am getting this msg. 


**** INCLUDING SCHEMATIC1.net ****
* source MEMRISTOR4
X_M1         IN OUT MEMRISTOR
V_V1         IN 0  AC 5AC
+SIN 0 1Vdc 500Hz 0 0 0
R_R1         OUT 0  1k TC=0,0 

**** RESUMING sim1.cir ****
.END

**** FROM LIBRARY C:\Cadence\SPB_16.6\tools\pspice\library\memristor4.lib ****
.SUBCKT memristor Plus Minus 
.PARAMS Ron=1K Roff=100K Rinit=80K D=10N uv=10F p=1
$
ERROR(ORPSIM-16363): Command invalid in subcircuit