pspice and transistor dimmer

I am trying to do the following simulation of part c, however I got the following error:

ERROR -- Convergence problem in DC sweep


  Last node voltages tried were:

 NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE


(N00199)    2.4001 (N00203)     .7638 (N00209)     .9348 (N00217)     .4674    

(N00227)    1.4022 (N00257)    2.4008 (N01638)    1.6006 (N01827)   -1.6006    

(N04503)     .1092 (N04958)   -2.5111 (N07526)   -1.9207 (N11412)     .1092    

(N20350)   -1.6266 (N21742)   -2.5111 (N22119)    -.3156


  These voltages failed to converge:

    V(N20350)                 =    -1.125V  \    -1.627V
    V(N22119)                 =  -405.22mV  \  -315.63mV

  These devices failed to converge:
    D_D6      

**** Interrupt ****


I am trying to simulate the LED by using 3 diodes here. Below is my circuit
I've created the simulation as suggested on the instructions so I am pretty sure I did not messed up there.
a.JPG
b.JPG
kuntilanakAsked:
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d-glitchCommented:
I think your voltage source Vcc is backwards.
The (-) terminal should be at ground.
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