KPCC has confirmed election officials at four additional counties in California know of active registered voters whose names were missing from printed poll rosters on Tuesday. Those counties include Inyo, Kings, Sonoma and Yuba. Election officials at several other counties have told KPCC they did not experience problems. The number of names in Inyo, Kings, Sonoma and Yuba counties are small: so far fewer than a dozen registered voters whose names should have appeared on the rosters are known to have been missing in error.