I got this message from yesterday. What shall I do?

I got iPhone Pro Max in December last year. Starting yesterday I got my photo function locked all of sudden. After I restarted my phone, I started to get the message that “Unable to verify the camera is authentic Apple product “. Now every time I turn on my phone I get this message. I don’t know why my phone camera got this problem and don’t know what I should do to fix it? Shall I go to the Apple store to get help from the Apple technicians?