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What is the meaning of error NG02100 in Angular?

Problem

Since some time we get an Error: NG02100 in our app. My problem is that I have no idea what is going and everything is working except one item in the navbar, but which has the identical code to the other components.

I tried checking the docs, but the error is not documented there. Did anybody else have this error and can help out?

We use these Angular packages in our app for reference:

"@angular/animations": "^13.2.1",
"@angular/common": "^13.2.1",
"@angular/compiler": "^13.2.1",
"@angular/core": "^13.2.1",
"@angular/forms": "^13.2.1",
"@angular/localize": "^13.2.1",
"@angular/platform-browser": "^13.2.1",
"@angular/platform-browser-dynamic": "^13.2.1",
"@angular/router": "^13.2.1",
"@angular/service-worker": "^13.2.1",
"@angular-devkit/architect": "^0.1302.2",
"@angular-devkit/build-angular": "^13.2.2",
"@angular-devkit/core": "^13.2.2",
"@angular-devkit/schematics": "^13.2.2",
"@angular-eslint/eslint-plugin": "~1.0.0",
"@angular-eslint/eslint-plugin-template": "~1.0.0",
"@angular-eslint/template-parser": "~1.0.0",
"@angular/cli": "^13.2.2",
"@angular/compiler-cli": "^13.2.1",
"@angular/language-service": "^13.2.1",
about 4 years ago · Juan Pablo Isaza
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