[Issue] 07-28 20:57:29.342 2159-2159/com.victor.travelassistant E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.victor.travelassistant, PID: 2159 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.victor.travelassistant/com.victor.travelassistant.MainActivity}: java.lang.InstantiationException: can't instantiate class com.victor.travelassistant.MainActivity at andr..