csv file upload database using php, file uploaded but httperroresponse

Question

<h1>Angular File Upload</h1>
<div>
<form [formGroup] = "uploadForm" (ngSubmit)="onSubmit()">
<div>
<input type="file" name="profile" (change)="onFileSelect($event)" />
</div>
<div>
<button type="submit">Upload</button>
</div>
</form>
</div>
import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup } from '@angular/forms';
import { HttpClient } from '@angular/common/http';
import {UploadService} from './upload.service';

@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {

uploadForm: FormGroup;

form: FormGroup;
uploadResponse;
SERVER_URL= "http://localhost/web_api/employee2.php";

constructor(private formBuilder: FormBuilder, private httpClient: HttpClient, private UploadService: UploadService) { }

ngOnInit() {
this.uploadForm = this.formBuilder.group({
profile: ['']
});
}
onFileSelect(event) {
if (event.target.files.length > 0) {
const file = event.target.files[0];
this.uploadForm.get('profile').setValue(file);
}


}
onSubmit() {
const formData = new FormData();
formData.append('file', this.uploadForm.get('profile').value);


// this.httpClient.post<any>(this.SERVER_URL, formData).subscribe(((response) => response.json())
this.UploadService.uploadFile(formData).subscribe(
(policy) => console.log(policy),
(err) => console.log(err)
);
}
}


import { Injectable } from '@angular/core';
import { HttpClient, HttpEvent, HttpErrorResponse, HttpEventType } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError, retry } from 'rxjs/operators';
import { map } from 'rxjs/operators';



@Injectable({
providedIn: 'root'
})
export class UploadService {


SERVER_URL: string = "http://localhost/web_api";
constructor(private httpClient: HttpClient) { }

public uploadFile(formData) {
console.log(formData);
let uploadURL = `${this.SERVER_URL}/employee2.php`;

return this.httpClient.post<any>(uploadURL, formData)
.pipe(
retry(1),
catchError(this.handleError)
);
}

handleError(error) {
let errorMessage = '';
if (error.error instanceof ErrorEvent) {
// client-side error
errorMessage = `Error: ${error.error.message}`;
} else {
// server-side error
errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;
}
window.alert(errorMessage);
return throwError(errorMessage);
}
}