java.lang.RuntimeException: Unable to start activity ComponentInfo{ie.example.artur.projectrepeat/ie.example.artur.projectrepeat.DataListActivity}: java.lang.NullPointerException

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Unable to start activity ComponentInfo{ie.example.artur.projectrepeat/ie.example.artur.projectrepeat.DataListActivity}: java.lang.NullPointerException
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Unable to start activity ComponentInfo{ie.example.artur.projectrepeat/ie.example.artur.projectrepeat.DataListActivity}: java.lang.NullPointerException
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Unable to start activity ComponentInfo{us.shandian.blacklight/info.papdt.blacklight.ui.statuses.UserTimeLineActivity}: java.lang.NullPointerException
java.lang.RuntimeException: Unable to start activity ComponentInfo{ie.example.artur.projectrepeat/ie.example.artur.projectrepeat.DataListActivity}: java.lang.NullPointerException
at ie.example.artur.projectrepeat.DataListActivity.onCreate(DataListActivity.java:30)
at android.app.Activity.performCreate(Activity.java:5426)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)

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