Process: my.edu.tarc.qrcodegenerator, PID: 6694
                  
                  
                      android.content.ActivityNotFoundException: Unable to find explicit activity class {my.edu.tarc.qrcodegenerator/my.edu.tarc.qrcodegenerator.SexClass}; have you declared this activity in your AndroidManifest.xml?
                  
                  
                          at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2005)
                  
                  
                          at android.app.Instrumentation.execStartActivity(Instrumentation.java:1673)
                  
                  
                          at android.app.Activity.startActivityForResult(Activity.java:4586)
                  
                  
                          at android.support.v4.app.BaseFragmentActivityApi16.startActivityForResult(BaseFragmentActivityApi16.java:54)
                  
                  
                          at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:67)
                  
                  
                          at android.app.Activity.startActivityForResult(Activity.java:4544)
                  
                  
                          at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:720)
                  
                  
                          at android.app.Activity.startActivity(Activity.java:4905)
                  
                  
                          at android.app.Activity.startActivity(Activity.java:4873)
                  
                  
                          at my.edu.tarc.qrcodegenerator.QRCodeScannerActivity$2$1$1.onClick(QRCodeScannerActivity.java:349)
                  
                  
                          at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:172)
                  
                  
                          at android.os.Handler.dispatchMessage(Handler.java:106)
                  
                  
                          at android.os.Looper.loop(Looper.java:193)
                  
                  
                          at android.app.ActivityThread.main(ActivityThread.java:6669)
                  
                  
                          at java.lang.reflect.Method.invoke(Native Method)
                  
                  
                          at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
                  
                  
                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
                  
                  
                
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