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This exception has no message.
java.lang.NullPointerException at NetworkCalls.getRequestQueue(NetworkCalls.java:42) at NetworkCalls.addToRequestQueue(NetworkCalls.java:48) at NetworkCalls.createLocationPost(NetworkCalls.java:72) at StaticMethods.handleWarnings(StaticMethods.java:84) at LocationService.checkInPost(LocationService.java:73) at LocationService$1.run(LocationService.java:66) at java.util.Timer$TimerImpl.run(Timer.java:284)