Faltal error when activate plugin

I just bought the plugin. When I just clicked on activate I get this fatal error. <b>Fatal error</b>: Uncaught Error: Class 'Puc_v4p6_Plugin_UpdateChecker' not found in ../public_html/wp-content/plugins/rss-feed-post-generator-echo/update-checker/Puc/v4p6/Factory.php:86 Stack trace: #0 .../public_html/wp-content/plugins/rss-feed-post-generator-echo/rss-feed-post-generator-echo.php(146): Puc_v4p6_Factory::buildUpdateChecker('https://wpiniti...', '/home/productio...', 'rss-feed-post-g...') #1 ..public_html/wp-admin/includes/plugin.php(2141): include('/home/productio...') #2 ../public_html/wp-admin/plugins.php(175): plugin_sandbox_scrape('rss-feed-post-g...') #3 {main} thrown in <b>..public_html/wp-content/plugins/rss-feed-post-generator-echo/update-checker/Puc/v4p6/Factory.php</b> on line <b>86</b>