'chromedriver' executable may have wrong permissions

I am trying to use selenium along with chrome web driver .chrome web driver .exe is already uploaded on the code files . How can I fix the following problem ?

self.service.start() File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/common/", line 76, in start os.path.basename(self.path), self.start_error_message) selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable may have wrong permissions. Please see

I'm pretty sure Chrome doesn't work in our virtualisation system. We have a version of Firefox installed that does work, though.