help me about VCO jitter simulation

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firefoxone

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vco jitter

Hello
when I simulation VCO jitter use specterRF pss and pnoise
the simulation no error report
but when plot the pnoise in jitterpnoise
CDS.log report error:
*Error* flip:can't handle flip(nil)
*Error* abs:can't handle abs(nil)
what the error meaning and how to solve?
thank you very much
 

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