ovi_tsb said about 3 years ago on Creating and Reading QR Codes :
Hi Dave, I did everything like you did  (I believe :)) ) but my camera doesn't start. I don't see any errors in my console and my canvas is displayed. What I have different is the ruby '2.4.1' and 'rails', '~> 5.2.4', '>='. Do you think those can block my camera?