ukazati

1. (na + acc.) to point out; to draw attention to
   Hvala što si mi ukazao na grešku. — Thanks for pointing out my mistake.
   Lekari su ukazali na opasnost od vrućine. — Doctors pointed out the danger of the heat.
2. (ukazati se) to present itself; to appear
   Ukazala mu se odlična prilika za posao. — A great job opportunity came his way.
   Veruju da im se ukazala Bogorodica. — They believe the Virgin Mary appeared to them.
3. (help, trust, honour) to show; to extend; to give
   Prolaznici su mu ukazali prvu pomoć. — Passers-by gave him first aid.
   Hvala vam na ukazanom poverenju. — Thank you for the trust you have shown.

In the sense 'to point out' it takes na + accusative: ukazati na problem.