Problem with Login after enabling autenication

Hi,
I'm in the Autentication function test. After I made the configuration as it is described in the example. Do I get the following error message. What is wrong here?
Fatal error: In Dataface_Table::loadTable() expected first argument to be a string but received 'Dataface_Table'On line 2359 of file C:\xampp\htdocs\xataface\Dataface\Table.php in function printStackTrace()
On line 29 of file C:\xampp\htdocs\xataface\Dataface\Serializer.php in function loadTable()
On line 135 of file C:\xampp\htdocs\xataface\Dataface\AuthenticationTool.php in function Dataface_Serializer()
On line 216 of file C:\xampp\htdocs\xataface\Dataface\AuthenticationTool.php in function checkCredentials()
On line 1551 of file C:\xampp\htdocs\xataface\Dataface\Application.php in function authenticate()
On line 5 of file C:\xampp\htdocs\xataface\getit\index.php in function display()
in C:\xampp\htdocs\xataface\Dataface\Table.php on line 2359
I'm in the Autentication function test. After I made the configuration as it is described in the example. Do I get the following error message. What is wrong here?
Fatal error: In Dataface_Table::loadTable() expected first argument to be a string but received 'Dataface_Table'On line 2359 of file C:\xampp\htdocs\xataface\Dataface\Table.php in function printStackTrace()
On line 29 of file C:\xampp\htdocs\xataface\Dataface\Serializer.php in function loadTable()
On line 135 of file C:\xampp\htdocs\xataface\Dataface\AuthenticationTool.php in function Dataface_Serializer()
On line 216 of file C:\xampp\htdocs\xataface\Dataface\AuthenticationTool.php in function checkCredentials()
On line 1551 of file C:\xampp\htdocs\xataface\Dataface\Application.php in function authenticate()
On line 5 of file C:\xampp\htdocs\xataface\getit\index.php in function display()
in C:\xampp\htdocs\xataface\Dataface\Table.php on line 2359