FormatException during fetchProducts

[Rockvole]

I added the print statement to see the response :

Launching lib/main.dart on Nexus 9 in debug mode...
Initializing gradle...
Resolving dependencies...
Running 'gradlew assembleDebug'...
Built build/app/outputs/apk/debug/app-debug.apk.
Installing build/app/outputs/apk/app.apk...
I/Choreographer(21684): Skipped 40 frames!  The application may be doing too much work on its main thread.
D/TTS     (21684): Language is not available - en_US
Syncing files to device Nexus 9...
D/BillingManager(21684): Creating Billing client.
D/BillingManager(21684): Starting setup.
D/BillingManager(21684): Setup finished. Response code: 0
D/BillingManager(21684): Setup successful. Querying inventory.
I/BillingManager(21684): Querying purchases elapsed time: 10ms
I/BillingManager(21684): Querying purchases and subscriptions elapsed time: 32ms
I/BillingManager(21684): Querying subscriptions result code: 0 res: 0
D/BillingManager(21684): Query inventory was successful.
I/flutter (21684): response={"status":"loaded","products":[{"localizedDescription":"Allows the installation of alternative keyboards created in the kbml 
I/flutter (21684): language.","localizedTitle":"Install custom keyboards (AAC Keyboard with friends)","price":"$6.99","priceLocale":"CAD","localizedPrice":"$6.99","productIdentifier":"com.rockvole.customize"}]}
E/flutter (21684): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (21684): FormatException: Control character in string (at character 126)
E/flutter (21684): ...ion":"Allows the installation of alternative keyboards created in the kbml 
E/flutter (21684):                                                                               ^
E/flutter (21684): 
E/flutter (21684): #0      _ChunkedJsonParser.fail (dart:convert/runtime/libconvert_patch.dart:1374:5)
E/flutter (21684): #1      _ChunkedJsonParser.parseString (dart:convert/runtime/libconvert_patch.dart:1047:16)
E/flutter (21684): #2      _ChunkedJsonParser.parse (dart:convert/runtime/libconvert_patch.dart:860:22)
E/flutter (21684): #3      _parseJson (dart:convert/runtime/libconvert_patch.dart:29:10)
E/flutter (21684): #4      JsonDecoder.convert (dart:convert/json.dart:542:36)
E/flutter (21684): #5      JsonCodec.decode (dart:convert/json.dart:169:41)
E/flutter (21684): #6      FlutterIap.stringToResponse (package:flutter_iap/flutter_iap.dart:38:45)
E/flutter (21684): #7      FlutterIap.fetchProducts (package:flutter_iap/flutter_iap.dart:21:12)
E/flutter (21684): <asynchronous suspension>
E/flutter (21684): #8      Globals.hasIAP (package:kbml_viewer/globals.dart:73:45)
E/flutter (21684): <asynchronous suspension>
E/flutter (21684): #9      _PreferencesAboutState.init (package:kbml_viewer/dialogs/about.dart:16:45)
E/flutter (21684): <asynchronous suspension>
E/flutter (21684): #10     _PreferencesAboutState.initState (package:kbml_viewer/dialogs/about.dart:26:5)
E/flutter (21684): #11     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3764:58)
E/flutter (21684): #12     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3630:5)
E/flutter (21684): #13     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #14     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #15     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4667:14)
E/flutter (21684): #16     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #17     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #18     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3666:16)
E/flutter (21684): #19     Element.rebuild (package:flutter/src/widgets/framework.dart:3508:5)
E/flutter (21684): #20     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3635:5)
E/flutter (21684): #21     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3630:5)
E/flutter (21684): #22     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #23     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #24     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4667:14)
E/flutter (21684): #25     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #26     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #27     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4667:14)
E/flutter (21684): #28     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #29     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #30     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4667:14)
E/flutter (21684): #31     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #32     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #33     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4667:14)
E/flutter (21684): #34     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #35     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #36     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3666:16)
E/flutter (21684): #37     Element.rebuild (package:flutter/src/widgets/framework.dart:3508:5)
E/flutter (21684): #38     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3635:5)
E/flutter (21684): #39     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3782:11)
E/flutter (21684): #40     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3630:5)
E/flutter (21684): #41     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2920:14)
E/flutter (21684): #42     Element.updateChild (package:flutter/src/widgets/framework.dart:2723:12)
E/flutter (21684): #43     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3666:16)
E/flutter (21684): #44   
Lost connection to device.

@ened

[Rockvole]

I got rid of the error by reducing the length of the Managed Product description (localizedDescription) to 66 characters. Although the Google console says that 80 characters max is permitted.

[JackAppDev]

Maybe related to #28