Injecting configuration and compiling...
Injecting scraper and running...
Traceback (most recent call last):
File "scraper.py", line 19, in <module>
driver = webdriver.Firefox()
File "/app/.heroku/python/lib/python2.7/site-packages/selenium/webdriver/firefox/webdriver.py", line 46, in __init__
self.binary, timeout),
File "/app/.heroku/python/lib/python2.7/site-packages/selenium/webdriver/firefox/extension_connection.py", line 46, in __init__
self.binary.launch_browser(self.profile)
File "/app/.heroku/python/lib/python2.7/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 43, in launch_browser
self._start_from_profile_path(self.profile.path)
File "/app/.heroku/python/lib/python2.7/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 64, in _start_from_profile_path
Popen([self._start_cmd, "-silent"], stdout=PIPE, stderr=PIPE).wait()
File "/app/.heroku/python/lib/python2.7/subprocess.py", line 709, in __init__
errread, errwrite)
File "/app/.heroku/python/lib/python2.7/subprocess.py", line 1326, in _execute_child
raise child_exception
AttributeError: 'NoneType' object has no attribute 'rfind'