Please make sure that Localize is installed in your Angular project and that it is included in the angular.json configuration.

  "dependencies": {
    "@angular/cdk": "^20.1.5",
    "@angular/common": "^20.0.0",
    "@angular/compiler": "^20.0.0",
    "@angular/core": "^20.0.0",
    "@angular/forms": "^20.0.0",
    "@angular/localize": "^20.0.0",
    "@angular/platform-browser": "^20.0.0",
    "@angular/router": "^20.0.0",

angular.json:

            "polyfills": [
              "zone.js",
              "@angular/localize/init"
            ],

Feel free to also check the official documentation:
https://www.telerik.com/kendo-angular-ui/components/troubleshooting/general-issues#missing-angular-localize-package-for-i18n-support