PageForm is installed on Translatewiki.net and after updating to the master version, we started encountering the following error,
[2019-07-15 10:16:05] exception.ERROR: [d36a84810bbf5d94a038a2d2] [no req] Error from line 845 of /srv/mediawiki/tags/2019-07-15_08:58:20/extensions/PageForms/includes/PF_FormPrinter.php: Call to undefined method OutputPage::addWikiText() {"exception":"[object] (Error(code: 0): Call to undefined method OutputPage::addWikiText() at /srv/mediawiki/tags/2019-07-15_08:58:20/extensions/PageForms/includes/PF_FormPrinter.php:845)","exception_id":"d36a84810bbf5d94a038a2d2","exception_url":"[no req]","caught_by":"mwe_handler"} []PageForm version: master
MediaWiki version: 1.34.0-alpha
See - https://gerrit.wikimedia.org/r/c/mediawiki/core/+/517890 {Remove OutputPage::addWikitext()* functions, hard-deprecated in 1.32}