Angular ERROR NullInjectorError: R3InjectorError(AppModule)的錯誤分析

core.js:6242 ERROR NullInjectorError: R3InjectorError(AppModule)[apiUrl -> apiUrl -> apiUrl]:

NullInjectorError: No provider for apiUrl!

at NullInjector.get (http://localhost:4200/vendor.js:62758:27)

at R3Injector.get (http://localhost:4200/vendor.js:76765:33)

at NgModuleRef$1.get (http://localhost:4200/vendor.js:94067:33)

at Object.get (http://localhost:4200/vendor.js:91801:35)

at getOrCreateInjectable (http://localhost:4200/vendor.js:66560:39)

at Module.ɵɵdirectiveInject (http://localhost:4200/vendor.js:80581:12)

at NodeInjectorFactory.SearchInputComponent_Factory [as factory] (http://localhost:4200/main.js:1432:174)

at getNodeInjectable (http://localhost:4200/vendor.js:66705:44)