file.readAsDataURL is not working in ionic 5

I am getting this error FileError: {"code":1,"message":"NOT_FOUND_ERR"} when i call this.file.readAsDataURL(directory, nameFile).

Error

Here my code:

selectFile() {
        let options = {
            quality: 100,
            sourceType: this.camera.PictureSourceType.PHOTOLIBRARY,
            saveToPhotoAlbum: false,
            correctOrientation: true,
            destinationType: this.camera.DestinationType.FILE_URI
        };

        if (this.isCordovaLib) {
            this.showSpinner = true;
            this.camera.getPicture(options).then((imagePath) => {
                //"b71d96bbf34fe3c7d54b8e5a36d260c2.jpg"
                let nameAndroidFile = imagePath.substring(imagePath.lastIndexOf('/') + 1, imagePath.lastIndexOf('?'));
                //"e:///data/user/0/com.xxx.ionicframeworkapp/cache/b71d96bbf34fe3c7d54b8e5a36d260c2.jpg?1603481469382"
                let nameIosFile = imagePath.substring(imagePath.lastIndexOf('tmp/') + 4, imagePath.length);
                //"b71d96bbf34fe3c7d54b8e5a36d260c2.jpg"
                let nameFile = this.platform.is('android') ? nameAndroidFile : nameIosFile;
                console.log('nameFile', nameFile);
                //"file:///storage/emulated/0/Android/data/com.xxx.ionicframeworkapp/cache/"
                let directory = this.platform.is('android') ? this.file.externalCacheDirectory : this.file.tempDirectory;
                // this.imagePath = this.webview.convertFileSrc(imagePath);
                this.file.readAsDataURL(directory, nameFile).then(
                    file64 => {
                        console.log('including file');
                        this.showSpinner = false;
                        this.fileSelected['body'] = file64.substring(file64.indexOf('base64,') + 7, file64.length);
                        this.fileSelected['name'] = nameFile;
                    },
                    error => {
                        this.showSpinner = false;
                        console.log('error', error);
                    }
                ).catch(err => {
                    this.showSpinner = false;
                    console.log('error', err);
                    alert('Error accessing the file');
                });
            },
                (err) => {

                    this.showSpinner = false;
                });
        }
    }

What am I doing wrong in code? Please help me to solve my issue.

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