Hey Cavor,
First I sincerely apologize for the delay in responding to you here in the forum. Unfortunately with the information you provided and for us to dig deeper into this problem (it sounds like the issue stems from the access token or lack thereof) I will need to request plugin information from you.
Because the information needed may requires submitting the access token, then for privacy reasons I am going to ask that you submit a support request directly through our support page here.
Additionally please add your plugin’s system info in your support request. To obtain this information go to your:
WordPress DashBoard > Facebook Feed > Settings > Support (tabbed page).
Select all text in the “System Info” by clicking in the box, copy and then paste the ‘System Info’ into your reply.
Also, if you are using the Free version of the plugin then be sure to select that version by using the dropdown arrow in the “Plugin Version” field on the support page form.
I will await your support request through our normal Facebook support page link provided above. Please mention that you had submitted a request in this forum so I can give the support ticket you submit through our Support page link high priority and again I apologize for the long response delay. In the meantime I hope your evening is going great.