用pspice仿真出现错误，请高手点拨迷津

再去pspice看看就是这些看不懂的东西了：



**** 10/15/11 12:03:45 ******* PSpice 16.3.0 (June 2009) ****** ID# 0 ********
** Profile: "SCHEMAtiC1-sd"  [ C:UserschehnDesktopcheng        wst-PSpiceFilesSCHEMATIC1sd.sim ]

****     CIRCUIT DESCRIPTION

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


** Creating circuit file "sd.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS
*Libraries:
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of G:CadenceSPB_16.3        oolsPSpicePSpice.ini file:
.lib "nom.lib"
*Analysis directives:
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..SCHEMATIC1.net"

**** INCLUDING SCHEMATIC1.net ****
* source TWST
R_R1         N00151 N00183  4 TC=0,0
R_R2         N00151 N00175  2 TC=0,0
R_R3         N00183 N00191  5 TC=0,0
R_R4         N00175 N00191  3 TC=0,0
R_R5         N00151 N00227  1 TC=0,0
V_V1         N00175 N00183 5Vdc
V_V2         N00227 N00191 10Vdc
**** RESUMING sd.cir ****
.END
ERROR -- Node N00151 is floating
ERROR -- Node N00183 is floating
ERROR -- Node N00175 is floating
ERROR -- Node N00191 is floating
ERROR -- Node N00227 is floating

真心纠结啊，各位大哥有木有看出来问题在哪的啊？
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