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Cause of unknown exception in detectMultiScale

I use OpenCV in Java. With this call:

faceDetector.detectMultiScale(m2, faceDetections, 1.3, 4, 0, new Size(
                10, 10), new Size(200, 200));

I get the following error:

Exception in thread "UserDetection" java.lang.Exception: unknown exception
    at org.opencv.objdetect.CascadeClassifier.detectMultiScale_0(Native Method)
    at org.opencv.objdetect.CascadeClassifier.detectMultiScale(CascadeClassifier.java:94)
    at test.hmi.FaceDetection.detect(FaceDetection.java:103)

The problem is that, without code changings, the error appered and stayed then until computer restart. After that I was unable to reproduce the error.

Therefore I want to ask what could be causes of this error message in the detectMultiScale function.