when i try to activate directory plugin I have this message

Hi,

when i try to activate directory plugin I have this message in the header of my admin dashboard:

Warning: mkdir(): Permission denied in /home/wwwgranj/public_html/wp-content/plugins/directory/core/data.php on line 247

Warning: copy(/home/wwwgranj/public_html/wp-content/mu-plugins/gateway-relay.php): failed to open stream: No such file or directory in /home/wwwgranj/public_html/wp-content/plugins/directory/core/data.php on line 250

Warning: copy(/home/wwwgranj/public_html/wp-content/mu-plugins/wpmu-assist.php): failed to open stream: No such file or directory in /home/wwwgranj/public_html/wp-content/plugins/directory/core/data.php on line 251