App crash when run injectCSSFileFromUrl

[omralcrt]

• I have read the README
• I have already searched for the same problem
• I have read and done the setup for Android: IMPORTANT Note for Android and iOS and IMPORTANT Note for Android
• I have read and done the setup for iOS: IMPORTANT Note for Android and iOS and IMPORTANT Note for iOS
• I have ran the sample app and it does not work there

Environment

Technology	Version
Flutter version	1.22.5
Plugin version	4.0.0+4
Android version	10
iOS version	12
Xcode version	12.3

Device information: OnePlus 5 & iPhone 12 Pro Max

Description

Expected behavior:
After run below code, I expect to apply given css.

inAppWebViewController.injectCSSFileFromUrl(urlFile: "urlFileString");

Current behavior:
But when run above code, app crash.

Unhandled Exception: MissingPluginException(No implementation found for method injectStyleFile on channel com.pichillilorenzo/flutter_inappwebview_0)

Stacktrace/Logcat

[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: MissingPluginException(No implementation found for method injectStyleFile on channel com.pichillilorenzo/flutter_inappwebview_0)
#0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:157:7)
<asynchronous suspension>
#1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:332:12)
#2      InAppWebViewController.injectCSSFileFromUrl (package:flutter_inappwebview/src/in_app_webview_controller.dart:1400:20)
#3      PostDetailViewModel.runCss.<anonymous closure> (package:Webrazzi/views/post_detail/post_detail_view_model.dart:135:18)
#4      ListMixin.forEach (dart:collection/list.dart:86:13)
#5      PostDetailViewModel.runCss (package:Webrazzi/views/post_detail/post_detail_view_model.dart:134:16)
#6      PostDetailView.buildHtml.<anonymous closure> (package:Webrazzi/views/post_detail/post_detail_view.dart:219:17)
#7      InAppWebViewController.handleMethod (package:flutter_inappwebview/sr<…>

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