I think the error is actually starting a bit earlier, around:
04-06 13:39:13.393: E/ScannerFramework(573): [ScannerContext::RemoveDataSubscriber] Subscriber not present in subscriber list
04-06 13:39:13.393: E/ScannerFramework(573): Transition from 1 to 1 is invalid
Something is going wrong in the Scanning framework but it is not possible to say what. Perhaps because the plugin is using the old motorolasolutions intents (the current API uses com.symbol.datawedge, Data Capture API - Zebra Technologies Techdocs ). The plugin is so simple, I don't see what else could be causing the issue.
The official recommendation is to build the intents yourself and not rely on Bluefetch, there is a blog here: Integrating DataWedge into your Cordova application , that would at least give you more control.