When i run my angular 12 project i get NullInjectorError: R3InjectorError(t)

Question

NullInjectorError: R3InjectorError(t)[t -> t -> t -> InjectionToken Application Initializer -> [object Object] -> t -> t -> oz -> sz -> t -> nce -> nce -> nce]: NullInjectorError: No provider for nce!

i have importet HttpClientModule in my apps.module