When trying to clear a warning during and upgrade from j4 to j5 I got a warning about a joomlart plugin that needed to be uninstalled. I found the plugin and tried to disable it and afterward I received the following message... Call to undefined method Joomla\CMS\Application\AdministratorApplication::isSite() Now none of the joomla administration backend works and this message pops up when accessing the URL for the page (www.aja3.com). How do I fix the problem? Delete the bad plugin? Thanks
andrewatx Hello
This error suggests that some parts of your site (such as a component, module, or plugin) may not yet be compatible with Joomla 5. However, I was able to access your site at aja3.com—did you manage to resolve the issue?