error: null is not an object (evaluating '_ reactNative.NativeModules.CustomCropManager.crop')

[CSFDuarte]

When trying to render the sample component from read.me file in the Android version, the app show an error related to this Native Module called CustomCropManager, which I have looked for information in google but didn't find anything.

[Michaelvilleneuve]

Hi, your module seems to have been linked incorrectly, can you please check it, or try manual linking ?

[ethienneroy]

@Michaelvilleneuve Hi, I have the same issue and my module looks like it's linked correctly. Do you have more info of how it should be linked ?

[justinsymph]

Same issue, any updates?

[manchi17]

Facing same issue.

[midhundeulect]

Same error

[justinjoyn]

I tried this:

import fr.michaelvilleneuve.customcrop.RNCustomCropPackage;
 protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
               ...
                new RNCustomCropPackage()
        );
    }

This did change the error:

[Michaelvilleneuve]

@justinjoyn and everyone here. It seems that something is missing in the documentation. This error means OpenCV or the module has not been linked, please try to follow the steps mentionned here https://github.com/Michaelvilleneuve/react-native-perspective-image-cropper/issues/26#issuecomment-505902166 and tell me if that helped

[manchi17]

@justinjoyn and everyone here. It seems that something is missing in the documentation. This error means OpenCV or the module has not been linked, please try to follow the steps mentionned here #26 (comment) and tell me if that helped

@Michaelvilleneuve I just tried this with no luck. Still getting the same error.

[Gricardov]

Did anyone fix it? :(

[Gricardov]

Chamos, I found the solution. Follow this step-by-step tutorial https://brainhub.eu/blog/opencv-react-native-image-processing/ If you still experience problems, turn on the debugger and all will work fine :)