Resolve error sendpress in wordpress

/*original archive sendpress.php*/
/****************************************************************************************/
function plugin_activation(){
        if ( version_compare( $GLOBALS['wp_version'], SENDPRESS_MINIMUM_WP_VERSION, '<' ) ) {
            deactivate_plugins( __FILE__ );
            wp_die( sprintf( __('SendPress requires WordPress version %s or later.', 'sendpress'), SENDPRESS_MINIMUM_WP_VERSION) );
        } else {
            if( SendPress_Option::get('version','0') == '0' ){
                SendPress_Option::set('sendpress_ignore_087', 'true');
                require_once(SENDPRESS_PATH .'inc/db/tables.php');
                require_once(SENDPRESS_PATH .'inc/db/status.table.php');
                require_once(SENDPRESS_PATH .'inc/db/open.click.table.php');
                SendPress_Option::set( 'version' , SENDPRESS_VERSION );

            }
        }
        //Make sure we stop the old action from running
        wp_clear_scheduled_hook('sendpress_cron_action_run');
        SendPress_Option::set( 'permalink_rebuild' , true );
        SendPress_Option::set( 'install_date' , time() );

    }
/*************************************************************************************/
/*Updated*/

function plugin_activation(){
        if ( version_compare( $GLOBALS['wp_version'], SENDPRESS_MINIMUM_WP_VERSION, '<' ) ) {
            deactivate_plugins( __FILE__ );
            wp_die( sprintf( __('SendPress requires WordPress version %s or later.', 'sendpress'), SENDPRESS_MINIMUM_WP_VERSION) );
        } else {
            //if( SendPress_Option::get('version','0') == '0' ){
                SendPress_Option::set('sendpress_ignore_087', 'true');
                require_once(SENDPRESS_PATH .'inc/db/tables.php');
                require_once(SENDPRESS_PATH .'inc/db/status.table.php');
                require_once(SENDPRESS_PATH .'inc/db/open.click.table.php');
                SendPress_Option::set( 'version' , SENDPRESS_VERSION );

            //}
        }
        //Make sure we stop the old action from running
        wp_clear_scheduled_hook('sendpress_cron_action_run');
        SendPress_Option::set( 'permalink_rebuild' , true );
        SendPress_Option::set( 'install_date' , time() );

    }