A multi-tone harmonic balance simulation problem in Cadence

There are 3 frequencies in my circuit: frf = 1955MHz, LO1 = 1960MHz, and LO2 = 1950MHz.

I'm setting up a 2-tone HB analysis:

hb hb oversample = [2 1] fundfreqs=[(lo1) (frf)] maxharms = [10 5]


When the simulation runs, it keeps telling me:

ERROR (SPCRTRF-15268): The source V63 couldn't find matched freq. Please make sure the fundfreqs is set up correctly in analysis.


But in V63, its frequency is set at flo2 = 1950MHz, which is 2 x 1955 - 1 x 1960... So what's wrong with this setup? Thanks!