new Pspice version suckz: Model used by is undefined

ich dache ich arbeite mich wiedermak in Pspice ein, aber es wird immer 
bescheuerter was die Bedienung betrifft.

Wir hatten an der Hochschule mal v9.x, damit lief es recht gut.

Im Geschäft nun v16.3 dachte mit dem Buch von Heinemann komme ich durch 
aber ich scheitere schon am Anfang.

Übung 3.2, Seite 62 folgende Fehlermeldung:

**** 12/20/11 13:29:59 ******* PSpice 16.3.0 (June 2009) ****** ID# 0 
********

 ** Profile: "SCHEMATIC1-trans"  [ 
\\siedle.de\supportzw\cadence_OrCAD_16.3\Projects\rc_schalt-PSpiceFiles\ 
SCHEMATIC1\trans.sim  ]


 ****     CIRCUIT DESCRIPTION


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




** Creating circuit file "trans.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY 
SUBSEQUENT SIMULATIONS

*Libraries:
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of 
C:\Cadence\SPB_16.3\tools\PSpice\PSpice.ini file:
.lib "C:\Cadence\SPB_16.3\tools\PSpice\UserLib\nom.lib"
.lib "C:\Cadence\SPB_16.3\tools\PSpice\UserLib\misc.lib"

*Analysis directives:
.TRAN  0 3ms 0
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"



**** INCLUDING SCHEMATIC1.net ****
* source RC_SCHALT
V_U1         N00138 0 1V
R_R1         N01092 N00190  100 TC=0,0
C_C1         0 N00190  1u  TC=0,0
.param         t_2_Sw2=5gs T_D_Sw2=1ms T_PERIODE_Sw2=10gs 
T_SWITCH_Sw2=1us
V1_Sw2         3_Sw2 0 pulse(1 0 {t_D_Sw2} {t_switch_Sw2} {t_switch_Sw2}
+ {t_2_Sw2} {t_periode_Sw2})
S1_Sw2         N01092 N00138 3_Sw2 0 Schalt
V2_Sw2        4_Sw2 0 pulse(0 1 {t_D_Sw2+t_switch_Sw2} {t_switch_Sw2}
+ {t_switch_Sw2} {t_2_Sw2-2*t_switch_Sw2} {t_periode_Sw2})
S2_Sw2        N01092 0 4_Sw2 0 Schalt

**** RESUMING trans.cir ****
.END

ERROR -- Model Schalt used by S1_Sw2 is undefined
ERROR -- Model Schalt used by S2_Sw2 is undefined