'unfotunately, google search stopped'. why this message is always displayed on my android phone?

I try to reset my phone but after a short period the problem appeared again. What is the permanent solution for this problem?

Hello and welcome to Android Central!

You can try doing two things.
1) Find Google Search is the "ALL" section of the application manager. Open and wipe data.
-or-
Settings>Device>Storage>Cache Data click to delete all app cache.

2) Boot device into recovery and wipe system cache.