Why I’m getting: No overload matches this call

I have theses method that I use to upload images to my backend in a project using Angular 8 and I never had problems. Recently I started a new project using angular 10 and try to use theses method again, but I'm getting several errors and I'm having a hard time making it work correctly.

I can ignore the errors, and everything works fine but I'm trying to make it correctly clean.

Can someone give some light on this problem?

Thanks in advance.

In my service I have:

  uploadLogo(file: File): Observable<HttpEvent<{}>> {
    const formData: FormData = new FormData();
    formData.append('file', file!);
    const req = new HttpRequest('POST', `${this.resourceUrl}/upload`, formData, {
      reportProgress: true,
      responseType: 'text',
    });
    return this.http.request(req);
  }

and on my component.ts I have:

  upload(): void {
    this.loadingImage = true;
    this.currentFileUpload = this.selectedFiles.item(0);
    this.eventService.uploadLogo(this.currentFileUpload).subscribe(
      (res: HttpResponse<any>) => this.onSaveSuccess(res.body),
      (res: HttpErrorResponse) => this.onSaveError(res)
    );
  }

  private onSaveSuccess(result: any): void {
    this.result = result;
  }

  private onSaveError(result: any): void {
    this.jhiAlertService.error(result.message, null, '');
  }

on my method upload() in the line:

(res: HttpResponse<any>) => this.onSaveSuccess(res.body),

i'm getting:

TS2769: No overload matches this call.  
 Overload 1 of 2, '(next: null | undefined, error: (error: any) => void, complete?: (() => void) | undefined): Subscription', gave the following error.  
   Argument of type '(res: HttpResponse<any>) => void' is not assignable to parameter of type 'null | undefined'.  
     Type '(res: HttpResponse<any>) => void' is not assignable to type 'null'.
 Overload 2 of 2, '(next?: ((value: HttpEvent<{}>) => void) | undefined, error?: ((error: any) => void) | undefined, complete?: (() => void) | undefined): Subscription', gave the following error.  
   Argument of type '(res: HttpResponse<any>) => void' is not assignable to parameter of type '(value: HttpEvent<{}>) => void'.  
     Types of parameters 'res' and 'value' are incompatible.  
       Type 'HttpEvent<{}>' is not assignable to type 'HttpResponse<any>'.

        

Read more here: https://stackoverflow.com/questions/65704636/why-im-getting-no-overload-matches-this-call