Can’t activate plugin

Hi,

I just download your plugin but can’t activate :

The extension could not be activated because it triggered a fatal error.

Fatal error: Cannot redeclare scb_init() (previously declared in /xxx/xxx/www/wp-content/plugins/wp-pagenavi/scb/load.php:101) in /xxx/xxx/www/wp-content/plugins/postmatic/vendor/scribu/scb-framework/load-composer.php on line 8

Thanks for help ??