I can't pair bisq mobile app

Following message appears when I click SCAN QR CODE button.

54

And I also tried pasting pairing token.
But anything hasn’t happened.

following is my environments:
MacOS ver10.15(Catalina)
Bisq v1.1.7
Bisq mobile app v1.1

I could pair when I use MacOS ver10.14(Mojave) and Bisq v1.1.5.

I still can’t use webcam but I made it to pair by pasting token again.