detRetClass what？where？

[GlenGithub]

03-05 15:08:34.773 14507-14507/com.facedetection D/FaceDetector: constructed.
03-05 15:08:34.773 14507-14507/com.facedetection D/dalvikvm: Trying to load lib /data/app-lib/com.facedetection-2/libandroid_dlib.so 0x42bedb70
03-05 15:08:34.783 14507-14507/com.facedetection D/dalvikvm: Added shared lib /data/app-lib/com.facedetection-2/libandroid_dlib.so 0x42bedb70
03-05 15:08:34.783 14507-14507/? A/native: F/jni_primitives.h:113 'detRetClass' Must be non NULL
03-05 15:08:34.783 14507-14507/? A/native: terminating.
03-05 15:08:34.783 14507-14507/? A/libc: Fatal signal 6 (SIGABRT) at 0x000038ab (code=-6), thread 14507 (m.facedetection)
03-05 15:08:34.783 14507-14507/? A/libc: Unable to open connection to debuggerd: Connection refused