@pradeepkv09 Hmm..... it is weird. Are you sure you use exactly the same query as I posted? I tried couple times and this can be accepted. Also technically it should be correct.
Maybe you can copy and paste and try again:
SELECT sum(distinct i1.TIV_2016) as TIV_2016 FROM insurance i1, insurance i2 where i1.PID != i2.PID AND i1.TIV_2015 = i2.TIV_2015 AND (i1.LAT,i1.LON) NOT IN (
select LAT, LON FROM insurance GROUP BY LAT, LON HAVING count(*) > 1