NumberFormatException when running mahout

Hello list,

I am trying to run the Big-Bench benchmark from
https://github.com/intel-hadoop/Big-Bench/ Everything runs fine, except
for query 20:

https://github.com/intel-hadoop/Big-Bench/tree/master/queries/q20

As you can see from the run.sh script in the above GitHub directory,
query 20 consists of 6 steps. After step 2, I have a
/user/bart/benchmarks/bigbench/temp/q20_hive_RUN_QUERY_0_temp directory
in my HDFS that contains one file called 000000_0 and has a content that
looks like

0 0.0 0.0 0.0 0
4 0.0 0.0 0.0 0
5 0.0 0.0 0.0 0
6 0.0 0.0 0.0 0
7 0.0 0.0 0.0 0
8 0.0 0.0 0.0 0
11 0.0 0.0 0.0 0
15 0.0 0.0 0.0 0
17 0.0 0.0 0.0 0
23 0.0 0.0 0.0 0
24 0.0 0.0 0.0 0
27 0.0 0.0 0.0 0
31 0.0 0.0 0.0 0
32 0.0 0.0 0.0 0
33 0.0 0.0 0.0 0
37 50.0 66.66666666666667 77.39147525947116 1
38 0.0 0.0 0.0 0
42 0.0 0.0 0.0 0
45 0.0 0.0 0.0 0
47 0.0 0.0 0.0 0
48 100.0 88.88888888888889 34.90258447119835 1
51 0.0 0.0 0.0 0
52 50.0 7.6923076923076925 0.16715403929463815 1
... and so on ...
... and so on ...
... and so on ...
15051 0.0 0.0 0.0 0
15052 0.0 0.0 0.0 0
15053 0.0 0.0 0.0 0
15056 50.0 26.923076923076923 16.24084215689073 2
15057 100.0 100.0 69.601

So until step 2, i think everything went fine. However, in step 3, I
get the following NumberFormatException: