Jni error (App bug): accessed stale local reference alternative way of appearing

Jni error (App bug): Accessed stale local reference this error is normally caused by a weak global variable, but today I encountered the following error in another case

The reason for the error is that the Java Layer function declaration, which is simply caused by your carelessness, is written in this way. Public native String screenshot (int x,int y,int x1,int y1,byte[] path);That's what JNI says. void Java_java_api_jniutil_screenshot (jnienv* env, jobject thiz,jint x,jint y,jint x1,jint y1,jbytearray Path) /c1>
Then there is no return value of the knot, so the error occurs, and when the function is finished, it returns .

From for notes (Wiz)