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setColor on only one led does not work

when calling blink.setColor(color, led) for led being LED_1 or LED_2, the blink1 does very strange things and end up with playing default pattern.

It's not possible to use fadeToColor() on the 2 leds at the same time

When I try to use fadeToColor on the 2 leds as above :

RGBColor led1_color = new RGBColor(random.nextInt(256), random.nextInt(256), random.nextInt(256));
blink.fadeToColor(led1_color, 3000, BlinkLed.LED_1);

RGBColor led2_color = new RGBColor(random.nextInt(256), random.nextInt(256), random.nextInt(256));
blink.fadeToColor(led2_color, 3000, BlinkLed.LED_2);

I got this exception :

Exception in thread "main" javax.usb.UsbClaimException: An interface is already claimed
    at org.usb4java.javax.AbstractDevice.claimInterface(AbstractDevice.java:404)
    at org.usb4java.javax.Interface.claim(Interface.java:102)
    at fr.craftinglabs.blink1.BlinkUsbDevice.sendCommand(BlinkUsbDevice.java:22)
    at fr.craftinglabs.blink1.Blink.fadeToColor(Blink.java:25)
    at fr.craftinglabs.blink1.Blink.main(Blink.java:48)

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