Raspberry pi native error

[mailmindlin]

When I call Webcam.open() on my raspberry pi (Raspbian), it throws a NullPointerException:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Java HotSpot(TM) Client VM warning: You have loaded library /tmp/BridJExtractedLibraries3057927121178160320/libbridj.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c ', or link it with '-z noexecstack'.
Detected webcam Live! Cam Sync HD VF0770 /dev/video0
Hi!
Webcam isn't null
Exception in thread "main" com.github.sarxos.webcam.WebcamException: Cannot execute task
at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.process(WebcamProcessor.java:57)
at com.github.sarxos.webcam.WebcamProcessor.process(WebcamProcessor.java:122)
at com.github.sarxos.webcam.WebcamTask.process(WebcamTask.java:38)
at com.github.sarxos.webcam.ds.cgt.WebcamOpenTask.open(WebcamOpenTask.java:20)
at com.github.sarxos.webcam.Webcam.open(Webcam.java:189)
at com.github.sarxos.webcam.Webcam.open(Webcam.java:149)
Caused by: java.lang.NullPointerException
at com.github.sarxos.webcam.ds.buildin.natives.OpenIMAJGrabber.startSession(Native Method)
at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDevice.open(WebcamDefaultDevice.java:253)
at com.github.sarxos.webcam.ds.cgt.WebcamOpenTask.handle(WebcamOpenTask.java:38)
at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.run(WebcamProcessor.java:66)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
This is thrown when it calls webcam.open()