Error "Can't resolve all parameters for provider"

[dilipkumar1007]

@MattE Please help me with the link:

Error: Can't resolve all parameters for HttpHeaders: (?). at syntaxError (http://localhost:8100/build/vendor.js)

I’m able to call my post API using postman by passing param using ‘x-www-form-urlencoded section’ method. now getting error while compile my Ionic 3 app with below details: import { Component, Injectable } from ‘@angular/core’; import { NavController } from ‘ionic-angular’; import { HttpClient,HttpHeaders, HttpParams, HttpClientModule } from ‘@angular/common/http’; values=’’; onKeydown(event: any) { this.values = event.target.value; let body = { stext: this.values }; let headers = new…