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There are several possible problems: 1. You use OpenCV Manager incompatible with you hardware platform. 2. You tries to use some OpenCV objects, i.e. VideoCapture before OpenCV initialization. For example, you have class field initialized like this:
private VideoCapture mCamera = new VideoCapture(...);
In such situation VideoCapture object construction is called on your object construction. If OpenCV is not ready the line of code invokes exception.