Your help really made it work, thank you very much.
At the beginning of my message to you I also wrote that I can't make autocomplete work properly. It's not showing me portfolio titles. Portfolio comes from the Gridstack Theme that is not default WordPress theme.
But it seems like that your plug-in searches a phrase “pro” which was ment to be “production” and in results it's showing me everything that contains “pro”. Just this autocomplete thing is not working.