Highlights

    The access token will be invalid

    1. If you changed the Facebook account password
    2. If you delete the app you use from Facebook apps list on facebook.com
    3. If the access token has expired (Most included apps have long lived access token)
    4. Facebook system can also invalidate the access token for security reasons.

    Reset your access token by re-authenticating the app you use from Settings page -> Facebook apps



    You can re-add your Facebook Account to solve this issue.

    in Troubleshooting
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