B4J Question Web-Camera


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I'm trying to implement "Web-Camera" on my system.
I copied the example of the site and downloaded all the required modules.
when you start the program receive log below:

Program started.
SLF4J: I 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.
Not enough args is boolean OpenIMAJGrabber.startSession (int, int, double)
Default cam: (Webcam) Webcam Microsoft LifeCam NX-6000 0
Open: true
Close: true

but this saving PNG normally.
this is normal or is it a problem?