java.lang.RuntimeException: Unable to start activity ComponentInfo{de.babytemp.babytempapp2/de.babytemp.babytempapp2.MainActivity}: java.lang.IllegalArgumentException: Unknown pattern character 'X'

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Unable to start activity ComponentInfo{de.babytemp.babytempapp2/de.babytemp.babytempapp2.MainActivity}: java.lang.IllegalArgumentException: Unknown pattern character 'X'
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Unable to start activity ComponentInfo{com.example.geevarughese.nav2/com.example.geevarughese.nav2.MainActivity}: java.lang.ClassCastException: com.example.geevarughese.nav2.MainActivity@3ddc1486 must implement OnFragmentInteractionListener
java.lang.IllegalArgumentException: Unknown pattern character 'X'
at java.text.SimpleDateFormat.validatePatternCharacter(SimpleDateFormat.java:314)
at java.text.SimpleDateFormat.validatePattern(SimpleDateFormat.java:303)
at java.text.SimpleDateFormat.(SimpleDateFormat.java:356)
at com.google.gson.DefaultDateTypeAdapter.(DefaultDateTypeAdapter.java:49)
at com.google.gson.GsonBuilder.addTypeAdaptersForDate(GsonBuilder.java:555)
at com.google.gson.GsonBuilder.create(GsonBuilder.java:543)
at de.babytemp.babytempapp2.Channel.(Channel.java:46)
at de.babytemp.babytempapp2.MainActivity.onCreate(MainActivity.java:41)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)

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