This error will only occur if you try to initialize a pixel ID more than once, so you need to check all of the JavaScript code loading on your site and find where the multiple calls to init your pixel ID are coming from.
Key area to check is to right-click on your site and click "View page source." Then check all referenced JavaScript files and any GTM containers you are referencing. I've heard of developers including the Facebook pixel code both in the of the site and in a GTM container, which would cause this error.
Error Code 4012 Facebook
Download: https://vittuv.com/2vCnzT
The client browser is then redirected to the facebook login page (the fb login page it is missing the details about what data is being requested) and the url contains the following error=access_denied&error_code=200&error_description=Permissions error&error_reason=user_denied
_api_login=1&api_key=xxxxxxxxxxxx&signed_next=1&next=https%3A%2F%2Fwww.facebook.com%2Fv2.5%2Fdialog%2Foauth%3Fredirect_uri%3Dhttps%3A%2F%2Fwww.mysite.com%2FLogin&state=Facebook&scope=email&response_type=code&client_id=xxxxxxxxx&ret=login&logger_id=xxxxxxxxxxxxx6&cancel_url=https%3A%2F%2Fwww.mysite.com%2FLogin%3Ferror%3Daccess_denied&error_code=200&error_description=Permissions error&error_reason=user_denied&state=Facebook#_=_&display=page&locale=en_US&logger_id=xxxxxxxxxxxxxxxxxxxxxxxx
Please try the rectification process for each error number.\nError code Error: 1002 is displayedError code Error: 1106 is displayedError code Error: 1107 or 2123 or 3218 or 7003 is displayedError code Error: 2200 is displayedError code Error: 4012 is displayedError code Error: 5010 is displayedError code Error: 7007 is displayedError code Error: 7016 is displayedError code Error: 1 to 30 or 50 to 200 or 300 is displayedIssue is still not resolved\nError code Error: 1002 is displayedThis error message may appear if the TV is not connected to the Internet . If the issue is not resolved after following the troubleshooting steps, update the TV software .Error code Error: 1106 is displayedFor details on the rectification process, refer to the following: Error: 1106 appears when trying to view an Internet video on the television. Error code Error: 1107 or 2123 or 3218 or 7003 is displayedFor details on the rectification process, refer to the following: Error: 1107 or 2123 or 3218 or 7003 appears during the network setup or when attempting to access Internet content. Error code Error: 2200 is displayedFor details on the rectification process, refer to the following. Error: 2200 appears on the TV when trying to access the network connection. Error code Error: 4012 is displayedA failure may be generated in this device. The product may need to be repaired.Error code Error: 5010 is displayedAn error is generated in the Internet processing of the programme. Please try the following.First, execute Internet Connectivity Symptoms.\nPress the HOME button, then select Help.Select Customer Support - Internet Connectivity Symptoms.\nIf there is any Failed in the diagnosis resultsPlease check the network connection setting .If all diagnosis results are OKCarry out confirmation in the following order.\nUpdate BRAVIA to the latest system software.For the system software, refer to the following. How do I perform a software update for my TV? Execute Refresh Internet Content.\nPress the HOME button, then select Settings.Select Network - Refresh Internet Content.\nIf the issue is not resolved after the rectification process shown above, reset the setting value to factory shipping status, and then check whether the issue is resolved.For details, refer to the following: How to reset the TV to its original factory settings .If an error is generated after reset is executed, a temporary network issue may be generated.It may be resolved after some time passes. Please try Refresh Internet Content again after a while.\n\nError code Error: 7007 is displayedThis error code may be displayed if the Internet connection is lost or the Internet line speed is low when the system software is updated via the Internet. Update the system software to the latest version by update using USB memory , and then check whether the problem is resolved.\nError code Error: 7016 is displayed\nThis error may be displayed depending on the environment setting of the Internet Service Provider (ISP)when the system software is updated via the Internet. Update the system software to the latest version by update using USB memory , and then check whether the problem is resolved.Error code Error: 1 to 30 or 50 to 200 or 300 is displayedThis is a communication issue with the connection target (server side). In the case of a temporary cause, the issue may be resolved after a while. First, retry the access after a brief interval.Issue is not resolved Update BRAVIA to the latest system software, and then check whether the issue is resolved.For the system software, refer to the following: How do I perform a software update for my TV? 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