Error on deploying to Android

[huythach]

I can build and copy libtensorflow_mnist.so file to armeabi-v7a folder but can't deploy to Android because of the following error.
Do you have any suggestion?
Thank you.

"No local changes, not deploying APK
$ adb shell am start -n "jp.narr.tensorflowmnist/jp.narr.tensorflowmnist.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Error while executing: am start -n "jp.narr.tensorflowmnist/jp.narr.tensorflowmnist.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=jp.narr.tensorflowmnist/.MainActivity }
Error type 3
Error: Activity class {jp.narr.tensorflowmnist/jp.narr.tensorflowmnist.MainActivity} does not exist.

Error while Launching activity"