PigStorage with '-schema' generates Unhandled internal error.

The following script generates the error listed below.

d1 = load 'test_data.txt' USING PigStorage() AS (f1: int, f2: int, f3: int, f4: int);
store d1 into 'test_out' using PigStorage('\t','-schema');

– 2014-03-11 19:33:36 ERROR Grunt:125 - ERROR 2998: Unhandled internal error. org/codehaus/jackson/annotate/JsonUnwrapped