Failure to Launch Barcode Scanning Service

1. Barcode scanning service.
I have imported the service Barcodeservice.
Added it under data.
Edited the success mapping with the 'text' result into the text input field.
Then invoked the barcode service to a button.
However, when running the tester.io application on my phone, the scan button fails to launch the camera, and does not carry out any functions.
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