Background Mode plugin closes my app - Ionic V5

Ionic Framework
1

I was trying to make my app stop relaunching when in background mode. Accordingly to the documentation, the Background Mode plugin (https://ionicframework.com/docs/native/background-mode) is the one to do fix it, but after I added and activated it now my apps stop working just before I try to open the camera or opening device files. Follow the app.component.ts code and after it the code that is called just before the app breaks:

initializeApp() {

   this.platform.ready().then(() => {

     this.statusBar.styleDefault();

     this.splashScreen.hide();

     this.backgroundMode.enable();

   });

 }

takePicture() {

    const page = this;
    page.camera.getPicture({
        quality: 80,
        destinationType: page.camera.DestinationType.FILE_URI,
        encodingType: page.camera.EncodingType.JPEG,
        mediaType: page.camera.MediaType.PICTURE
      } as CameraOptions).then((imageURL) => {
        const that = page;
        // @ts-ignore
        window.resolveLocalFileSystemURL(imageURL, function success(file) {
          getFileSizeAndRun(file, (fileProc, fileSize) => {
            console.log(fileProc);
            that.storageFileUploadUtils.addUploadQueue({
              id: new Date().getMilliseconds() * -1,
              multipartFile: fileProc.file,
              fileExtension: FileTypeEnum.JPG,
              loading: true,
              error: false,
              fileSize,
              originalName: fileProc.name
            } as StorageFile);
            that.loading = false;
            that.changeRef.detectChanges();
          });
        }, () => console.log('trying to use this...'));
       }, (err) => {
        throw Error('Erro ao carregar recuperar a foto.');
       });
  }