Error Schematic not found

[AlyIbrahim]

I am getting this error:

sudo npm install -g @ssilvert/keycloak-schematic
ng generate keycloak --collection @ssilvert/keycloak-schematic --clientId=keycloak
An unhandled exception occurred: Schematic "keycloak" not found in collection "@schematics/angular".

Angular CLI: 11.2.8
Node: 14.16.0
OS: linux x64

Angular: 11.2.9