Google search has stopped keeps popping up, what should I do?

[AC Question]

"Google search has stopped" keeps popping up

I have Samsung Galaxy core and a message "Google search has stopped" keeps popping up. I can text and my phone keeps on freezing. I tried turning off and on my device and I even turn it off for a day and the message is still showing. I check my settings however I cannot see a Google Search app installed in my device. What should I do? need help.