run gps error in https://github.com/cbfinn/gps

[yaqi guo]

When I run gps, https://github.com/cbfinn/gps I meet problems below

gyq@gyq:~/gyq/gps$ gps -h

/home/gyq/gyq/gps/python/gps/gps_main.py: line 1:  This file defines the main object that runs experiments. : command not found
import: not authorized `mpl' @ error/constitute.c/WriteImage/1028.
/home/gyq/gyq/gps/python/gps/gps_main.py: line 4: syntax error near unexpected token `'Qt4Agg''

/home/gyq/gyq/gps/python/gps/gps_main.py: line 4: `mpl.use('Qt4Agg')'

How can I solve it?