Apache Pig permissions issue
Probably your pig.temp.dir setting. It defaults to /tmp on hdfs. Pig will write temporary result there. If you don't have permission to /tmp, Pig will complain. Try to override it by -Dpig.temp.dir.
A problem might be that hadoop.tmp.dir is a directory on your local filesystem, not HDFS. Try setting that property to a local directory you know you have write access to. I've run into the same error using regular MapReduce in Hadoop.