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java.lang.ArrayIndexOutOfBoundsException: -1	at qz.utils.ShellUtilities.getCupsPrinters(Unknown Source)	at qz.utils.PrintingUtilities.getPrinterId(Unknown Source)	at qz.utils.PrintingUtilities.getDriver(Unknown Source)	at qz.printer.PrintServiceMatcher.getPrintersJSON(Unknown Source)	at qz.ws.PrintSocketClient.processMessage(Unknown Source)	at qz.ws.PrintSocketClient.onMessage(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.eclipse.jetty.websocket.common.events.annotated.CallableMethod.call(CallableMethod.java:70)	at org.eclipse.jetty.websocket.common.events.annotated.OptionalSessionCallableMethod.call(OptionalSessionCallableMethod.java:68)	at org.eclipse.jetty.websocket.common.events.JettyAnnotatedEventDriver$2.run(JettyAnnotatedEventDriver.java:210)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)	at java.lang.Thread.run(Thread.java:745)