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EpwmInterrupt problem 28335 experiment kit

Hi all,

I have a question that my program will work if I set

PieVectTable.EPWM1_INT = &epwm1_isr;
PieVectTable.EPWM2_INT = &epwm2_isr;
PieVectTable.EPWM3_INT = &epwm3_isr;

However if I set 

PieVectTable.EPWM1_INT = &epwm1_isr;
PieVectTable.EPWM2_INT = &epwm2_isr;
PieVectTable.EPWM3_INT = &epwm3_isr;
PieVectTable.EPWM4_INT = &epwm4_isr;

the program will told me load program error. Encounter a problem loading file 28335epwmupaq.out.

Is there any body knows why this happens?

Thanks,

Jianyang Liu