MediaWiki API result

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

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{
    "error": {
        "code": "internal_api_error_Wikimedia\\Assert\\PreconditionException",
        "info": "[a3624c044ad49a89a8a31a2c] Exception caught: Precondition failed: This Title instance does not represent a proper page, but merely a link target.",
        "errorclass": "Wikimedia\\Assert\\PreconditionException",
        "*": "Wikimedia\\Assert\\PreconditionException at /var/www/html/vendor/wikimedia/assert/src/Assert.php(49)\nfrom /var/www/html/vendor/wikimedia/assert/src/Assert.php(49)\n#0 /var/www/html/includes/title/Title.php(3891): Wikimedia\\Assert\\Assert::precondition(boolean, string)\n#1 /var/www/html/includes/title/Title.php(3872): MediaWiki\\Title\\Title->assertProperPage()\n#2 /var/www/html/includes/Revision/RevisionStore.php(1830): MediaWiki\\Title\\Title->getId(boolean)\n#3 /var/www/html/includes/Revision/RevisionStore.php(1735): MediaWiki\\Revision\\RevisionStore->ensureRevisionRowMatchesPage(stdClass, MediaWiki\\Title\\Title)\n#4 /var/www/html/includes/Revision/RevisionStore.php(1613): MediaWiki\\Revision\\RevisionStore->newRevisionFromRowAndSlots(stdClass, NULL, integer, MediaWiki\\Title\\Title, boolean)\n#5 /var/www/html/includes/api/ApiFeedContributions.php(221): MediaWiki\\Revision\\RevisionStore->newRevisionFromRow(stdClass, integer, MediaWiki\\Title\\Title)\n#6 /var/www/html/includes/api/ApiFeedContributions.php(190): ApiFeedContributions->feedItem(stdClass)\n#7 /var/www/html/includes/api/ApiMain.php(1946): ApiFeedContributions->execute()\n#8 /var/www/html/includes/api/ApiMain.php(922): ApiMain->executeAction()\n#9 /var/www/html/includes/api/ApiMain.php(893): ApiMain->executeActionWithErrorHandling()\n#10 /var/www/html/includes/api/ApiEntryPoint.php(158): ApiMain->execute()\n#11 /var/www/html/includes/MediaWikiEntryPoint.php(199): MediaWiki\\Api\\ApiEntryPoint->execute()\n#12 /var/www/html/api.php(44): MediaWiki\\MediaWikiEntryPoint->run()\n#13 {main}"
    }
}