How to make artificial intelligence, avoiding collisions?

At the outset, I would like to apologize for my English.
As the title he wanted me to do the actor who will attack the player. The opponent can not run in a straight line because its my way are various obstacles statically Tilesets and other actors. Does anyone of you know groan do to our monster could avoid obstacles or twozyć himself the fastest route to the player?
Waiting for your help!

I believe there is an a* pathfinding extension which may do what you want.

When fires a * pathfinding extension errors pop up I could kots help me?
Crashes me "Bot" I join a screenshot.

como puedo hacer que mis enemigos disparen y se muevan
?