MediaWiki API result

This is the HTML representation of the JSON format. HTML is good for debugging, but is unsuitable for application use.

Specify the format parameter to change the output format. To see the non-HTML representation of the JSON format, set format=json.

See the complete documentation, or the API help for more information.

{
    "error": {
        "code": "internal_api_error_MWUnknownContentModelException",
        "info": "[ee8d6ddae3b78459234f2066] Exception caught: The content model 'NewsletterContent' is not registered on this wiki. See https://www.mediawiki.org/wiki/Content_handlers to find out which extensions handle this content model.",
        "errorclass": "MWUnknownContentModelException",
        "*": "MWUnknownContentModelException at /home/sustevfz/public_html/includes/content/ContentHandler.php(265)\n#0 /home/sustevfz/public_html/includes/Revision/RevisionStore.php(1470): ContentHandler::getForModelID(string)\n#1 /home/sustevfz/public_html/includes/Revision/RevisionStore.php(1636): MediaWiki\\Revision\\RevisionStore->loadSlotContent(MediaWiki\\Revision\\SlotRecord, NULL, NULL, NULL, integer)\n#2 [internal function]: MediaWiki\\Revision\\RevisionStore->MediaWiki\\Revision\\{closure}(MediaWiki\\Revision\\SlotRecord)\n#3 /home/sustevfz/public_html/includes/Revision/SlotRecord.php(307): call_user_func(Closure, MediaWiki\\Revision\\SlotRecord)\n#4 /home/sustevfz/public_html/includes/Revision/RevisionRecord.php(175): MediaWiki\\Revision\\SlotRecord->getContent()\n#5 /home/sustevfz/public_html/includes/api/ApiFeedContributions.php(177): MediaWiki\\Revision\\RevisionRecord->getContent(string)\n#6 /home/sustevfz/public_html/includes/api/ApiFeedContributions.php(148): ApiFeedContributions->feedItemDesc(MediaWiki\\Revision\\RevisionStoreRecord)\n#7 /home/sustevfz/public_html/includes/api/ApiFeedContributions.php(112): ApiFeedContributions->feedItem(stdClass)\n#8 /home/sustevfz/public_html/includes/api/ApiMain.php(1593): ApiFeedContributions->execute()\n#9 /home/sustevfz/public_html/includes/api/ApiMain.php(531): ApiMain->executeAction()\n#10 /home/sustevfz/public_html/includes/api/ApiMain.php(502): ApiMain->executeActionWithErrorHandling()\n#11 /home/sustevfz/public_html/api.php(87): ApiMain->execute()\n#12 {main}"
    }
}