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🟥 ERROR: Package Uninstall: Missing manifest file.​

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Solution

  • go to phpMyAdmin page
  • find database _joomla, table _extensions
  • find app that you want to uninstall from Joomla, e.g. pkg_POWrSocialFeed in this case and copy it img_6.png
  • go to administrator/manifests/packages directory
  • find XML file of app you want to uninstall from Joomla (it can be pkg_POWRSocialFeed.xml, pkg_powrsocialfeed.xml, etc) and rename it to name that was copied above, i.e. pkg_POWrSocialFeed.xml
  • go to joomla administrator extensions page and try to uninstall extension

🟥 ERROR: Undefined constant "JPATH_"​

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Solution (src: https://issues.joomla.org/tracker/joomla-cms/38840)

  • download plugin for joomla https://www.powr.io/joomla/pkg_powrsocialfeed.zip
    • please change pkg_powrsocialfeed part according to app type
  • unpack downloaded file
  • unpack pkg_powrsocialfeed/packages/mod_powrsocialfeed.zip file
  • remove pkg_powrsocialfeed/packages/mod_powrsocialfeed.zip file
  • open file pkg_powrsocialfeed/packages/mod_powrsocialfeed/mod_powrsocialfeed.xml
  • add string client="site" img.png
  • archive pkg_powrsocialfeed/packages/mod_powrsocialfeed directory
  • remove pkg_powrsocialfeed/packages/mod_powrsocialfeed directory
  • archive pkg_powrsocialfeed directory
  • try to install resulting pkg_powrsocialfeed.zip to Joomla img_1.png