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There are two switched shunts at buses 16020 and 17054 using dynamics model CHSVCT. It seems like the supplemental modulation function (SMF) is activated with ICON(I+1), but there is no branch defined in ICON(I+2) to ICON(I+4).

The error message is harmless, it just informs that the SDM control is not active. Try to change ICON(I+1) to 0 to disable the control.