Nativescript : camera photo asset with nativescript-ocr - ocr

Question

I'm trying to take a picture with the nativescript camera module and to run
the nativescript-ocr module (https://github.com/EddyVerbruggen/nativescript-ocr) on it .
Here is my code :
public saveToGallery: boolean = true;
public keepAspectRatio: boolean = true;
public width: number = 300;
public height: number = 300;
private ocr: OCR;
constructor() {
this.ocr = new OCR();
}
ngOnInit(): void {
}
onTakePhoto() {
let options = {
width: this.width,
height: this.height,
keepAspectRatio: this.keepAspectRatio,
saveToGallery: this.saveToGallery
};
takePicture(options).
then((imageAsset) => {
console.log("Result is an image asset instance");
let img: ImageSource = new ImageSource();
img.fromAsset(imageAsset).then((success) => {
if (success) {
this.ocr.retrieveText({
image: img,
whitelist: "ABCDEF",
blacklist: "0123456789",
onProgress: (percentage: number) => {
console.log(`Decoding progress: ${percentage}%`);
}
}).then(
(result: RetrieveTextResult) => {
console.log(`Result: ${result.text}`);
}, (error: string) => {
console.log(`Error: ${error}`);
})
}
});
}).catch((err) => {
console.log("Error -> " + err.message);
});
}
onRequestPermissions() {
requestPermissions();
}
}
Camera plugin works fine, takes and saves a picture, but when i'm running onTakePhoto i get this error message :
"Error in ocr.retrieveText: Error: java.lang.IllegalArgumentException: Data path does not exist!"
i'm not sure to use the .fromAsset the right way,
but i try a lot of thing to solve this problem
what i'm doing wrong?
Resolve : i didn't create corectly my tesseract/tessdata folder