w3af not working on kali errors galore

[m0be1]

raceback (most recent call last):
File "./w3af_gui", line 13, in
dependency_check()
File "/root/w3af-kali/w3af/core/ui/gui/dependency_check/dependency_check.py", line 40, in dependency_check
should_exit = mdep_check(dependency_set=GUI, exit_on_failure=False)
File "/root/w3af-kali/w3af/core/controllers/dependency_check/dependency_check.py", line 69, in dependency_check
pip_distributions = pip.get_installed_distributions()
AttributeError: 'module' object has no attribute 'get_installed_distributions'