it’s probably because your global @angular/ cli, project @angular/cli version or @angular/compiler-cli doesn’t match.
Debugging this
first of all run
ng -v
to check the global version of your angular, then compare the version with your angular project versions. if it matches with them or no.
If something doesn’t match, update or downgrade it. For example to downgrade project @angular/cli run
npm uninstall -D @angular/cli npm install -D @angular/[email protected]
To upgrade global run @angular/cli run
npm install -g @angular/cli@latest
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