我做PSpice9直流掃描分析（DC Sweep)來驗證二極管的V-I特性曲線時候
,無法出現porbe窗口
出現如下信息
**** 05/22/05 14:30:06 *********** Evaluation PSpice (Nov 1999) **************

** Profile: "SCHEMATIC1-111"  [ C:\Program Files\OrCAD_Demo\111-SCHEMATIC1-111.sim ]


****     CIRCUIT DESCRIPTION


******************************************************************************




** Creating circuit file "111-SCHEMATIC1-111.sim.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries:
* Local Libraries :
* From [PSPICE NETLIST] section of pspiceev.ini file:
.lib "nom.lib"

*Analysis directives:
.DC LIN V_V1 -110 10 0.01
.PROBE
.INC "111-SCHEMATIC1.net"


**** INCLUDING 111-SCHEMATIC1.net ****
* source 111
V_V1         N00016 GND 0Vdc
D_D1         N00016 GND D1N4002

**** RESUMING 111-SCHEMATIC1-111.sim.cir ****
.INC "111-SCHEMATIC1.als"



**** INCLUDING 111-SCHEMATIC1.als ****
.ALIASES
V_V1            V1(+=N00016 -=GND )
D_D1            D1(1=N00016 2=GND )
_    _(GND=GND)
_    _(GND=GND)
.ENDALIASES

**** RESUMING 111-SCHEMATIC1-111.sim.cir ****
.END

ERROR -- Node N00016 is floating
ERROR -- Node GND is floating


不知道怎么會事?
高手解答,萬分感謝