Back up problem while connecting my mac

I have MacOS Catalina version 10.15.4 Today, I was trying to connect my iPhone to may mac so I can back up my data on my mac but a problem disturbed me when I plugged in my original power cable between my mac and iPhone. As usual, I got this question. 'Do you trust this computer?' I tried to touch 'trust' but it keeps giving me the same question with a blinking screen. Then, in case of any loose contact in cable I used another power cable but problem persists. Now screen is locked with 'Do you trust this computer?' question and I cannot enter my password. Do you have any suggestions?

P.S. I checked both iphone and mac their versions are both up to date.