Cake ACL

I have installed the AclExtras Plugin

and within the plugin have the following: 

public $dataSource = 'default';

my default datasource is: 

public $default = array(
        'datasource' => 'Database/Sqlserver',
        'persistent' => false,
        'host' => 'IAINROSE\SQLEXPRESS',
        'login' => 'administrator',
        'password' => 'd3veloper',
        'database' => 'clearview',
        'prefix' => '',
    );

The rest of the app can connect and functions as normal, but when I try and run the plugin commands e.g. 

cake -app "c:\wamp\www\app" AclExtras.AclExtras aco_sync

I get the following error: 

database connect Sqlserver is missing, or could not be created??

Any ideas why only the plugin can not connect??

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