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java.lang.RuntimeException: Unknown exception. at org.bytedeco.javacpp.opencv_videoio$VideoCapture.grab(Native Method) at org.bytedeco.javacpp.OpenCVFrameGrabber.grab(OpenCVFrameGrabber.java:244) at edu.wpi.grip.core.sources.GrabberService.runOneGrab(GrabberService.java:73) at edu.wpi.grip.core.sources.GrabberService.run(GrabberService.java:64) at com.google.common.util.concurrent.AbstractExecutionThreadService$1$2.run(AbstractExecutionThreadService.java:60) at com.google.util.concurrent.Callables$3.run(Callables.java:100) at java.lang.Thread.run(Thread.java:745)