python problem?

Hello:
I am trying to run the loop protocol by command:

mpirun -np 4 /soft/rosetta3.3/rosetta_source/bin/loopmodel.default.linuxgccrelease -db /soft/rosetta3.3/rosetta_database @flags >log &

but it said:

/usr/bin/env: python2.6: No such file or directory

anybody have any idea?

THX