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This question already has an answer here:

i have htc wildfire 3 i can not scan qr code for whatsApp web i see the "OK, got it" button , no problem with that but it seems camera keep scanning but not getting anything any idea how to fix that ? every thing is updated already

marked as duplicate by bmdixon, Matthew Read Nov 2 '15 at 17:19

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It happened to me once because I had a slow internet connection. Connect to a high speed internet and try again.

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