No suitable injection token for parameter 'service' of class code example

Example 1: No suitable injection token for parameter 'path' of class 'BaseModel'

Update the Constructor

//import { Inject } from '@angular/core';

constructor(@Inject(String) private url: string, private http: Http)

Example 2: Angular 9 : Error NG2003: No suitable injection token for parameter 'url' of class 'DataService'. Found string

//import { Inject } from '@angular/core';

constructor(@Inject(String) private url: string, private http: Http)