help with pspice 22.4

I am designing a Schmidt trigger by an op amp this is the pspice file i do not know what i am doing wrong here is the output does
anybody know what this issue is


**** 04/10/12 21:27:52 *********** Evaluation PSpice (Nov 1999) **************

* E:\Program Files\OrCAD_Demo\PSpice\desgins\Proj1-PSpiceFiles\PSpice examples\lib\lib\Schematic22.4.sch


**** CIRCUIT DESCRIPTION


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




* Schematics Version 9.1 - Web Update 1
* Tue Apr 10 21:27:49 2012



** Analysis setup **
.ac LIN 250 1hz 50hz
.noise V([VOUT]) V_V1 3
.DC LIN V_15V 1 15V 5
.tran/OP 22ps 3600ps
.OPTIONS STEPGMIN
.STEP OCT V_-15V 1 -15V 3
.TEMP 44
.TF V([VOUT]) V_15V
.OP
.sens V([VOUT])


* From [PSPICE NETLIST] section of pspiceev.ini:
.lib "E:\Program Files\OrCAD_Demo\ModelLib2.lib"
.lib "nom.lib"

.INC "Schematic22.4.net"

**** INCLUDING Schematic22.4.net ****
* Schematics Netlist *



C_C1 VIN 0 0.1UF
V_V1 VIN 0 AC 106,50hz
+SIN 3 12 50hz 0 0 0
V_15V 15V 0 15V
V_-15V 0 -15V -15V
RT_R1 -15V 0 {(10K*(1-2.0))+.001}
RB_R1 0 0 {(10K*2.0)+.001}
R_R2 VIN VOUT 100k
R_R3 -15V VOUT 100k
C_C4 15V 0 1.0 UF IC=0.5V
------------------------$
ERROR -- unknown parameter
C_C5 -15V 0 1.0 uF IC=0.5V
-------------------------$
ERROR -- unknown parameter
E_U4 VOUT 0 VALUE {LIMIT(V(-15V,15V)*1E6,-15V,+15V)}

**** RESUMING Schematic22.4.cir ****
.INC "Schematic22.4.als"



**** INCLUDING Schematic22.4.als ****
* Schematics Aliases *

.ALIASES
C_C1 C1(1=VIN 2=0 )
V_V1 V1(+=VIN -=0 )
V_15V 15V(+=15V -=0 )
V_-15V -15V(+=0 -=-15V )
RT_R1 R1(1=-15V t=0 )
RB_R1 R1(t=0 2=0 )
R_R2 R2(1=VIN 2=VOUT )
R_R3 R3(1=-15V 2=VOUT )
C_C4 C4(1=15V 2=0 )
C_C5 C5(1=-15V 2=0 )
E_U4 U4(OUT=VOUT +=-15V -=15V )
_ _(VIN=VIN)
_ _(-15V=-15V)
_ _(3=-15V)
_ _(VOUT=VOUT)
_ _(VC1=VOUT)
_ _(15V=15V)
.ENDALIASES


**** RESUMING Schematic22.4.cir ****
.probe


.END