Exception in thread "main" java.io.IOException: Permission denied

Hi,
I am new to mahout. I complied mahout and tried to run
classify-20newsgroups.sh program, but it shows permission denied exception.

Exception in thread "main" java.io.IOException: Permission denied
at java.io.UnixFileSystem.createFileExclusively(Native Method)
at java.io.File.createTempFile(File.java:1879)
at org.apache.hadoop.util.RunJar.main(RunJar.java:115)

I googled around, but could not fix this. Please let me know how to solve
this.

Regards,
Samiran