Ok, nothing wrong with 2.9 (anything over 2.7 should work). What's the actual output of
Almost certainly it's a good idea to update to a 1.1rc1-era psi4 rather than a (presumably) 1.0-era. Instructions below. You might face the same error at the end, but least it'll be a more modern Psi.
Download one of the six installers (Linux/Mac; Py27, 35, 36; presently at http://vergil.chemistry.gatech.edu/download/). bash it. Follow the prompts and do make the adjustments to PATH and PSI_SCRATCH that it suggests at the end. Test with psi4 --test. Done.