致命例外:E/AndroidRuntime(31558):由:java.lang.NullPointerException引起。

I'm new to Android and expecially in fragment. I'm trying to create a simple app with 2 activities. the first(MainActivity) send a message taken from EditText(fragment_main_activity) and brings it, thanks to the Intent, to the second(SecondActivity) and dislpays it with a textView(fragment_second_activity).I'm new to Android and expecially in fragment.