java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:210)
at com.google.common.collect.ImmutableCollection$ArrayBasedBuilder.add(ImmutableCollection.java:339)
at com.nytimes.crossword.retrofit.ImmutablePuzzleData$Builder.addAnswers(ImmutablePuzzleData.java:443)
at com.nytimes.crossword.retrofit.GsonAdaptersRetrofit$PuzzleDataTypeAdapter.readInAnswers(GsonAdaptersRetrofit.java:2004)
at com.nytimes.crossword.retrofit.GsonAdaptersRetrofit$PuzzleDataTypeAdapter.eachAttribute(GsonAdaptersRetrofit.java:1933)

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