Cannot run a simulation

[ghost]

I'm trying to run this software in simulation mode. According to this documentation it should be easy, but it isn't. Can't pass through this step.

root@a0c4a22bf04d:/home/ubuntu/openwsn/openwsn-fw# scons board=python toolchain=gcc oos_openwsn
scons: Reading SConscript files ...
File "/home/ubuntu/openwsn/openwsn-fw/SConstruct", line 142

print "Unknown switch {0}.".format(key)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?

root@a0c4a22bf04d:/home/ubuntu/openwsn/openwsn-fw#