Yes above user is correct and if you are not able to do then I would suggest that you better follow the following method,
- Disable secure browsing in Facebook settings if it is enabled for that go to account settings then go to security and in secure browsing.
- Switch browsers; I would suggest Firefox and also make sure the browser is upgraded to the latest version
- Update flash player
- Delete all browser cache and cookies
- Delete flash cache, for that click here; just click the "delete all sites" button.
- Uninstall and reinstall the game in Facebook (don't worry, your progress will be saved)
- Check to see if your OS is up to date
- Restart computer your system
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