Encountering Angular Material UI issues following the transition from version 11 to 12

I am currently in the process of updating my Angular application from version 11 to 12, integrating Angular Material, and encountering some error messages:

Error No.1

- Error NG8002: Cannot bind to 'ngModel' as it is not a recognized property of 'mat-select'.
1. If 'mat-select' is an Angular component with 'ngModel' input, ensure it is part of this module.
2. If 'mat-select' is a Web Component, add 'CUSTOM_ELEMENTS_SCHEMA' to '@NgModule.schemas' to suppress the message.
3. To allow any property, add 'NO_ERRORS_SCHEMA' to '@NgModule.schemas'.

2697         <mat-select placeholder="Supervisor" style="width: 60%; margin-bottom:10px" [(ngModel)]="supervisor">
                                                                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~ 

Error No.2

- Error NG8001: 'mat-toolbar' is not a recognized element:
1. If 'mat-toolbar' is an Angular component, verify its inclusion in this module.
2. If 'mat-toolbar' is a Web Component, add 'CUSTOM_ELEMENTS_SCHEMA' to '@NgModule.schemas' to suppress the message.

2     <mat-toolbar role="toolbar" class="task-header mt_toolbar">
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error No.3

 - Error NG8001: 'mat-icon' is not a recognized element:
1. If 'mat-icon' is an Angular component, confirm its presence within this module.
2. If 'mat-icon' is a Web Component, add 'CUSTOM_ELEMENTS_SCHEMA' to '@NgModule.schemas' to suppress the message.

2691         <mat-icon style="color: black;">close</mat-icon>
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error No.4

- Error NG8001: 'mat-form-field' is not a recognized element:
1. If 'mat-form-field' is an Angular component, verify its inclusion in this module.
2. If 'mat-form-field' is a Web Component, add 'CUSTOM_ELEMENTS_SCHEMA' to '@NgModule.schemas' to suppress the message.

2230       <mat-form-field class="mb-1" style="width: 100%;height: 60px;">

Error No.5

- Error: Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: $map: #2813e4 is not a map.
   ╷
43 │     default: map.get($base-palette, $default),
   │              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
...

Here is my package.json

{
  ...
}

and tsconfig.json

/* To learn more about this file see: https://angular.io/config/tsconfig. */
{
  ...
}

I have imported all material modules inside app.module.ts


...

If there are any other requirements to resolve these issues, please let me know.

Answer №1

To fix the issue, reconstruct the package.json and yarn.lock files. Create a new Angular project and then transfer the updated package.json and yarn.lock into your existing projects. This method successfully resolved my problem.

I found the solution by following the link provided below:

https://github.com/angular/angular-cli/issues/20967

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