Please follow the step below to fix this problem:
1. Login in your Facebook account, open the page you are trying to create a feed with. Go to Page Settings and make sure Page visibility option is set to Page published.
2. From the upper-right corner of your Facebook account, please choose Settings, then select Business integrations option from the left sidebar. Check 10Web social feed plugin, then remove it.
3. As the last step, please go to the WordPress administrative dashboard of your website, navigate to Facebook Feed WD > Options page and reauthenticate.
Please have a look at this screencast, which demonstrates these steps.
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