I'm getting the error below... the dataset appears fine. The egg appears to be in the right place... [root@admin galaxy-dist]# ls -l ./eggs | grep pexpect -rw-rw-r-- 1 galaxy galaxy 78539 Jul 30 08:11 pexpect-2.4-py2.6.egg [root@admin galaxy-dist]# python --version Python 2.6.6 Traceback (most recent call last): File "./scripts/set_metadata.py", line 31, in <module> import galaxy.model.mapping # need to load this before we unpickle, in order to setup properties assigned by the mappers File "/panfs/storage.local/opt/galaxy-dist/lib/galaxy/model/__init__.py", line 9, in <module> eggs.require("pexpect") File "/panfs/storage.local/opt/galaxy-dist/lib/galaxy/eggs/__init__.py", line 414, in require raise EggNotFetchable( str( [ egg.name for egg in e.eggs ] ) ) galaxy.eggs.EggNotFetchable: ['pexpect'] I found a mention of this problem in a few places but no solution other than to use python 2.6.6.