Plugin Won’t Activate

I receive the following error messages when I try to activate the plugin:

Warning: copy() expects parameter 1 to be a valid path, object given in C:\xampp\htdocs\xxx\wp-admin\includes\class-wp-filesystem-direct.php on line 243

Catchable fatal error: Object of class WP_Error could not be converted to string in C:\xampp\htdocs\xxx\wp-admin\includes\class-wp-filesystem-direct.php on line 282

WooCommerce version 3.2.6
Wordpress version 4.9.1