java.lang.NullPointerException: lock == null

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java.lang.NullPointerException: lock == null
at java.io.Reader.(Reader.java:64)
at java.io.BufferedReader.(BufferedReader.java:107)
at java.io.BufferedReader.(BufferedReader.java:95)
at com.example.com.ecoassistant_03.Populator.populate(Populator.java:38)
at com.example.com.ecoassistant_03.ActMain.onOptionsItemSelected(ActMain.java:1182)

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