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Unable to locate WordPress content directory (wp-content).

Adding below code to wp-config.php file will solve your problem:

if(is_admin()) {
   add_filter('filesystem_method', create_function('$a', 'return "direct";' ));
   define( 'FS_CHMOD_DIR', 0751 );
}
Above is quick fix I found on Wordpress support but problem is with permissions.

For details please follow link

Please check you permissions:

All FILES should have permissions set to 644

All DIRECTORIES (i.e. folders) should have permissions set to 755

For Correct file Permissions

Thanks!