ERROR(ORPSIM-16152): Invalid number

Hi everyone,

I'm struggling with an "invalid number" error in PSpice A/D, which I couldn't resolve by myself :(

The message I get looks like this: 

*Libraries: 
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of C:\trololololololololo\SPB_Data\cdssetup\OrCAD_PSpice/16.6.0/PSpice.ini file:
.lib "nom.lib" 

*Analysis directives: 
.DC LIN PARAM V(UGS) -3V -0.1V 0.05V 
----------------$
ERROR(ORPSIM-16152): Invalid number
.OPTIONS ADVCONV
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*)) 
.INC "..\SCHEMATIC1.net" 

**** INCLUDING SCHEMATIC1.net ****
* source DESIGN1
G_G1         N00157 0 VALUE { -{IDSS}*PWR(1-V(N00148,0)/{Up},2) }
V_UGS         N00148 0  AC 10mA
+SIN -1V 0.5V 1k 0 0 0
R_R1         0 N00157  1k TC=0,0 
.PARAM  up=-3v idss=12ma

**** RESUMING JFET1.cir ****
.END

It's a quite simple cirquit with a resistor, a sinusoid voltage source, a param element from the special library and a GValue element from the ABM library. The simulation profile is a DC-Sweep which raises the Source from -3V to -0.1V.

Thanks in advance for your help,

Oli