Instapy doesn't start

Hello,
when starting mac_start.command I get this issue:

InstaPy Version: 0.6.8
._. ._. ._. ._. ._. ._. ._. ._.
Workspace in use: "/Users/bunly/InstaPy"
Traceback (most recent call last):
File "../quickstart.py", line 24, in
headless_browser=False)
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/instapy/instapy.py", line 319, in __init__
self.logger,
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/instapy/browser.py", line 114, in set_selenium_local_session
options=firefox_options,
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/selenium/webdriver/firefox/webdriver.py", line 174, in __init__
keep_alive=True)
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 157, in __init__
self.start_session(capabilities, browser_profile)
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 252, in start_session
response = self.execute(Command.NEW_SESSION, parameters)
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
self.error_handler.check_response(response)
File "/Users/bunly/anaconda3/lib/python3.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities

logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

Can anyone help me please?

KR