To run the example it is recommended to use the Tabris.js CLI.
The example can not be run directly from this directory since cordova doesn't allow to consume plugins if they are contained in a parent folder. Instead copy the example to an unrelated directory and adjust the config.xml of the example to point the tabris-plugin-barcode-scanner directory.
Using the Tabris.js CLI the example can be started by running:
$ tabris run <platform>