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Exception in thread "main" java.lang.NullPointerException
at XBeeConfig.send_and_recv(XBeeConfig.java:62)
at XBeeConfig.clearInput(XBeeConfig.java:94)
at XBeeConfig.mightAlreadyBeConfigured(XBeeConfig.java:147)
at XBeeConfig.config(XBeeConfig.java:188)
at XBeeConfig.config(XBeeConfig.java:165)
at config_test.main(config_test.java:16)
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