Unable to install

It looks like maybe for some reason Matomo was not correctly installed. In the past these were known reasons for this:

• The WP-Matomo Integration plugin is installed and configured to run in PHP mode. If that’s the case, we should detect this in the system report
• The?WordFence?plugin is causing an issue. A user installed Matomo Beta, uninstalled it, and later installed it again from the WordPress directory and then this error appeared. It was fixed by deleting all the DB entries that contained?matomo?from these tables:?wp_wfKnownFileList?and?wp_wfFileMods?as well as the?external_updates-matomo?entry from the?wp_option?table. This error likely only occurred while using the initial beta which was hosted on our servers and then updating the plugin from the WordPress directory.

If you’re still having issue, please send us a copy of your system check report.

No access to Matomo tab:

Error thrown

Class “Piwik\Plugins\SitesManager\Model” not found

Can you please confirm if this is the plugin you installed? https://www.ads-software.com/plugins/matomo/

If it is, please try to disable all your plugins and activate only the Matomo plugin and let’s see if it will give you access to Matomo tab.

Every plugin disabled but Matomo: I get

Fatal error: Uncaught Error: Class “Piwik\Plugins\SitesManager\Model” not found in /srv/http/wordpress/wp-content/plugins/matomo/classes/WpMatomo/Admin/SystemReport.php:997 Stack trace: #0 /srv/http/wordpress/wp-content/plugins/matomo/classes/WpMatomo/Admin/SystemReport.php(252): WpMatomo\Admin\SystemReport->get_wordpress_info() #1 /srv/http/wordpress/wp-content/plugins/matomo/classes/WpMatomo/Admin/SystemReport.php(288): WpMatomo\Admin\SystemReport->get_error_tables() #2 /srv/http/wordpress/wp-content/plugins/matomo/classes/WpMatomo/Admin/Menu.php(183): WpMatomo\Admin\SystemReport->errors_present() #3 /srv/http/wordpress/wp-includes/class-wp-hook.php(308): WpMatomo\Admin\Menu->add_menu() #4 /srv/http/wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #5 /srv/http/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action() #6 /srv/http/wordpress/wp-admin/includes/menu.php(155): do_action() #7 /srv/http/wordpress/wp-admin/menu.php(420): require_once(‘…’) #8 /srv/http/wordpress/wp-admin/admin.php(158): require(‘…’) #9 {main} thrown in /srv/http/wordpress/wp-content/plugins/matomo/classes/WpMatomo/Admin/SystemReport.php on line 997

Thank you for sending us that error. After deactivating the plugins except Matomo plugin, can you please increase your PHP memory_limit. You might want to reach out with your web hosting so they can help you increase it.