I'm sorry to hear that you were seeing that error message. I went into your account and I'm not seeing any errors and I'm seeing that we are posting to your Facebook page the Social Posts.
If this happens again, the best thing to do is to remove the Facebook connection from within your account and then to remove the app within Facebook. Then re-connect them.
To remove from Constant Contact:
Go to your Sweepstakes
Go to Social Posts
Where it says Add Channel, click on Manage Channels
Remove your Facebook page that is giving you the error message
Then log into your Facebook account
Click on the drop down arrow where you would go to log out
Click on Settings
On the next screen, click on Apps
You may have to click to View All
Look for the Constant Contact app and hover over it and click the X to remove
Once it's removed go back to your account with us and click on Add Channel and click on Facebook to reconnect
That will restore the connection and you should not see this error again.
Try that out and let us know if you have any other questions!