Ahh... the problem is not that classes are missing. It is that the code that is reading the matrix wants to see a LongWritable for the row number and is getting an IntWritable instead.
I think that your file containing your matrix was somehow created incorrectly. This isn't necessarily your error, but I think that the error exists. 2010/11/25 Fernando Fernández <[email protected]> > java.lang.IllegalStateException: java.io.IOException: wrong key class: > org.apache.hadoop.io.IntWritable is not class > org.apache.hadoop.io.LongWritable >
