follow ：

Once the code pasted on your pages, don't forget to test if the code works correctly, by calling your page with the parameter debugclickheat. For example for http://www.site.com/index.html call http://www.site.com/index.html?debugclickheat. You should see a message showing the state of Clickheat. If you encounter any problem, feel free to contact us

error：

Warning: require_once(/var/www/piwik/core/Exception/NotYetInstalledException.php): failed to open stream: No such file or directory in /var/www/piwik/plugins/ClickHeat/libs/click.php on line 40

Fatal error: require_once(): Failed opening required '/var/www/piwik/core/Exception/NotYetInstalledException.php' (include_path='/var/www/piwik/vendor/pear/pear_exception:/var/www/piwik/vendor/pear/console_getopt:/var/www/piwik/vendor/pear/pear-core-minimal/src:/var/www/piwik/vendor/pear/archive_tar:.:/usr/share/php:/usr/share/pear') in /var/www/piwik/plugins/ClickHeat/libs/click.php on line 40

version problem？