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Error running this package's example app: type '(MethodCall) => Null' is not a subtype of type '((MethodCall) => Future<dynamic>)?' in type castW #73

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HarryAtSaltus opened this issue Oct 18, 2021 · 9 comments · May be fixed by #74
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Error running this package's example app: type '(MethodCall) => Null' is not a subtype of type '((MethodCall) => Future<dynamic>)?' in type castW #73

HarryAtSaltus opened this issue Oct 18, 2021 · 9 comments · May be fixed by #74

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@HarryAtSaltus
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When I execute the example app included in the package, the following error occurs.

════════ Exception caught by widgets library ═══════════════════════════════════
The following _CastError was thrown attaching to the render tree:
type '(MethodCall) => Null' is not a subtype of type '((MethodCall) => Future)?' in type cast

When the exception was thrown, this was the stack
#0 new BluetoothPrint._
package:bluetooth_print/bluetooth_print.dart:26
#1 BluetoothPrint._instance
package:bluetooth_print/bluetooth_print.dart:29
#2 BluetoothPrint._instance (package:bluetooth_print/bluetooth_print.dart)
package:bluetooth_print/bluetooth_print.dart:1
#3 BluetoothPrint.instance
package:bluetooth_print/bluetooth_print.dart:31
#4 new _MyAppState
package:print_ticket/main.dart:17
#5 MyApp.createState
package:print_ticket/main.dart:13
#6 new StatefulElement
package:flutter/…/widgets/framework.dart:4754
#7 StatefulWidget.createElement
package:flutter/…/widgets/framework.dart:737
#8 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3668
#9 Element.updateChild
package:flutter/…/widgets/framework.dart:3425
#10 RenderObjectToWidgetElement._rebuild
package:flutter/…/widgets/binding.dart:1198
#11 RenderObjectToWidgetElement.mount
package:flutter/…/widgets/binding.dart:1167
#12 RenderObjectToWidgetAdapter.attachToRenderTree.
package:flutter/…/widgets/binding.dart:1112
#13 BuildOwner.buildScope
package:flutter/…/widgets/framework.dart:2573
#14 RenderObjectToWidgetAdapter.attachToRenderTree
package:flutter/…/widgets/binding.dart:1111
#15 WidgetsBinding.attachRootWidget
package:flutter/…/widgets/binding.dart:944
#16 WidgetsBinding.scheduleAttachRootWidget.
package:flutter/…/widgets/binding.dart:924
(elided 11 frames from class _RawReceivePortImpl, class _Timer, dart:async, and dart:async-patch)
@DeadBryam DeadBryam linked a pull request Oct 22, 2021 that will close this issue
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@Mubassir-developer
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Not a good practice, but you can change the below changes manually in the package.

DeadBryam@1f15040

@egoan82
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egoan82 commented Nov 17, 2021

Hello,

I have the same problem, what can I do?

sshot-8

@10urbulut
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Hello,

I have the same problem, what can I do?

sshot-8

@htetaunglin
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I have also this issue.
Screen Shot 2021-11-28 at 12 08 27 AM

@cazmo99
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cazmo99 commented Nov 28, 2021

hello, I am also having the same issue. Hopefully it will be resolved. Thank you

@skylastn
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skylastn commented Feb 5, 2022

just change your package code -> bluetooth_print.dart from :
BluetoothPrint._() { _channel.setMethodCallHandler((MethodCall call) { _methodStreamController.add(call); return; } as Future<dynamic> Function(MethodCall)?); }

to this:

BluetoothPrint._() { _channel.setMethodCallHandler((MethodCall call) async{ _methodStreamController.add(call); return; }); }

@Giuliopretis
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This error breaks the package, they should fix this as soon as possible.

@aharoldk
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Please fix this simple issue

@YouSour
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YouSour commented Oct 28, 2022 •
edited
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still not update ?

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Litle fixes DeadBryam/bluetooth_print
10 participants
@YouSour @aharoldk @egoan82 @htetaunglin @skylastn @Giuliopretis @cazmo99 @Mubassir-developer @10urbulut @HarryAtSaltus