Package Conflict in Flutter how to resolve? - flutter

Question

When creating a QR Code reader app in VSCode, I wanted to use two different packages and implement certain functionalities from both, since one package has some functionality that the other does not.
The two packages in question are:
qr_code_scanner
qrscan
While I had been working on the project with only the first (qr_code_scanner) package added to my pubspec.yaml, the project could compile and run. However, once I added the second (qrscan) package to my pubspec.yaml, my project could not compile and would show the error.
\android\app\src\main\kotlin\com\example\qrcodereader\MainActivity.kt: (14, 49): Unresolved reference: onFlutterViewDestroyed
Wondering if it is possible to resolve this issue, or if not possible, how I can restore to a previously working state, since removing either package from my pubspec.yaml does not remove the package from my flutter project.
If required, flutter doctor:
[√] Flutter (Channel stable, 1.22.2, on Microsoft Windows [Version 10.0.19041.572], locale en-US)
• Flutter version 1.22.2 at C:\src\flutter
• Framework revision 84f3d28555 (5 days ago), 2020-10-15 16:26:19 -0700
• Engine revision b8752bbfff
• Dart version 2.10.2
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at C:\Users\Daniel Seah\AppData\Local\Android\sdk
• Platform android-29, build-tools 29.0.3
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
• All Android licenses accepted.
[√] Android Studio (version 4.0)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 47.1.2
• Dart plugin version 193.7361
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
[√] VS Code (version 1.50.1)
• VS Code at C:\Users\Daniel Seah\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.15.1
[√] Connected device (2 available)