angular app

import { HttpClient, HttpHeaders } from '@angular/common/http';

import { Injectable } from '@angular/core';
import { Observable, throwError } from 'rxjs';
import { catchError, retry } from 'rxjs/operators';
import {Location, LocationStrategy, PathLocationStrategy} from '@angular/common';

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  location: Location;   
  apiURL='http://207.38.84.105/CT/api';
  constructor(private http: HttpClient,location: Location){
    this.location = location;
   } 
  Login(data){
    return this.http.post(this.apiURL + '/loginCT.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  queryCandidateget(data){
    return this.http.post(this.apiURL + '/queryCandidateget.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  searchInsert(data){
    return this.http.post(this.apiURL + '/insertCandidateSearches.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  InsertEmployee(data){
    return this.http.post(this.apiURL + '/insertEmployee.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  InsertOffers(data){
    return this.http.post(this.apiURL + '/insertCandidateoffer.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  InsertBlackList(data){
    return this.http.post(this.apiURL + '/insertCandidateBlacklist.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  GetEmployees(data){
    return this.http.post(this.apiURL + '/getEmoloyeesbyCompanyId.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  GetBlackList(data){
    return this.http.post(this.apiURL + '/getBlacklistbyCompanyId.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  GetOffers(data){
    return this.http.post(this.apiURL + '/getOffersbyCompanyId.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
  Deleteblacklist(data){
    return this.http.post(this.apiURL + '/deleteBlacklistbyId.php',data)
    .pipe(
      retry(1),
      catchError(this.handleError)
    )
  }
   // Error handling 
   handleError(error) {
    let errorMessage = '';
    if(error.error instanceof ErrorEvent) {
      // Get client-side error
      errorMessage = error.error.message;
    } else {
      // Get server-side error
      errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;
    }
    window.alert(errorMessage);
    return throwError(errorMessage);
 }
}

       <form [formGroup]="firstFormGroup" style="width: 80%;">

  <input formControlName="LastName" >

</form>

 this.firstFormGroup = this._formBuilder.group({ 
       FirstName: ['', Validators.required],  
      LastName: ['', Validators.required],
      PAN:[''],
      Aadhaar: [''],  
      Mobile: ['', Validators.required],
      Email:['', Validators.required],        
      BlackListedOn: ['', Validators.required],
      Reason: ['', Validators.required],
      CandidateResponse:[''],
      Attach1:[''],
      Attach2:[''],
      Attach3:['']
      });  }

const routes: Routes = [
  { path: 'login', component: LoginComponent },
  { path: 'admin', loadChildren: () => import('./pages/postLogin/admin/admin.module').then(m => m.AdminModule) },
 ]