Magento 1.4.2 : errors when saving custom customer Attributes

I can't save my custom customer attributes:

My Magento backend is blocked and I get this errors :

2011-08-03T12:27:36+00:00 ERR (3): Warning: include(Mage\Customer\Model\Attribute\Data\.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory  in C:\xampp\htdocs\magento_test142_3\lib\Varien\Autoload.php on line 93

2011-08-03T12:27:36+00:00 ERR (3): Warning: include() [<a href='function.include'>function.include</a>]: Failed opening 'Mage\Customer\Model\Attribute\Data\.php' for inclusion (include_path='C:\xampp\htdocs\magento_test142_3\app\code\local;C:\xampp\htdocs\magento_test142_3\app\code\community;C:\xampp\htdocs\magento_test142_3\app\code\core;C:\xampp\htdocs\magento_test142_3\lib;.;C:\xampp\php\PEAR')  in C:\xampp\htdocs\magento_test142_3\lib\Varien\Autoload.php on line 93

This is my module code: in file mysql4-install-0.1.0.php:

<?php
$installer=new  Mage_Customer_Model_Entity_Setup ('core_setup');
$installer->startSetup();


$installer->addAttribute('customer', 'kd_nr', array(
    'label'        => 'Kundennummer',
    'visible'      => true,
    'required'     => false,
    'position'     => 20,
   ));   
Mage::getSingleton( 'eav/config' )
->getAttribute( 'customer', 'kd_nr' )
->setData( 'used_in_forms', array( 'adminhtml_customer' ) )
->save();

$installer->endSetup();

and here is my config.xml file:

<?xml version="1.0"?>
<config>
    <modules>
        <Mycompany_Newattcustomer>
            <version>0.1.1</version>
        </Mycompany_Newattcustomer>
    </modules>
    <global>


                <resources>
                    <newattcustomer_setup>
                        <setup>
                            <module>Mycompany_Newattcustomer</module>
                        </setup>
                        <connection>
                            <use>core_setup</use>
                        </connection>
                    </newattcustomer_setup>
                </resources>
         <fieldsets>
            <customer_account>
                        <kd_nr><create>1</create><update>1</update></kd_nr> 
            </customer_account>                
         </fieldsets>        

    </global>
</config>

I use Magento 1.4.2

Please help to solve this problem.

Thanks a lot.

[edit]

Thanks a lot for help, the code of Nasaralla seems to be working, but I discover that my problem come from a YES/NO select: Here is the code for the select box:

$installe开发者_如何学运维r->addAttribute('customer', 'in_search', array(
    'label'        => 'Appear in search',
    'type'         => 'int',
    'input'        => 'select',
    'source'       => 'eav/entity_attribute_source_boolean',
    'visible'      => true,
    'required'     => false,
   ));   
Mage::getSingleton( 'eav/config' )
->getAttribute( 'customer', 'in_search' )
->setData( 'used_in_forms', array( 'adminhtml_customer' ) )
->save();

It will be very helpful if anyone help me to solve the really problem

[/edit]

Get rid of this part in install script

Mage::getSingleton( 'eav/config' )
->getAttribute( 'customer', 'kd_nr' )
->setData( 'used_in_forms', array( 'adminhtml_customer' ) )
->save();

In order to call eav_setup you do

$setup = new Mage_Eav_Model_Entity_Setup('core_setup');

and then you can updateAttribute like:

$setup->updateAttribute ($entityTypeId,$id,$field,$value = null,$sortOrder=null)

You can get the list of methods you can call in here:

Freegento-Eav-Model-entity-setup

Therefore your code, I think, will be replaced by:

$setup->updateAttribute('customer', 'kd_nr', 'used_in_forms', 'adminhtml_customer');

Ok if the above didn't work at all ... I think lets revert back to your original script and I think I can spot some fixes:

    <?php
$installer=new  Mage_Customer_Model_Entity_Setup ('core_setup');
$installer->startSetup();

$installer->addAttribute('customer', 'kd_nr', array(
    'label'           => 'Kundennummer',
    'is_visible'      => 1,
    'is_required'     => 0,
    'sort_order'      => 20,
   ));   

    $attr = Mage::getSingleton( 'eav/config' )->getAttribute( 'customer', 'kd_nr' );
$attr->setData( 'used_in_forms', array( 'adminhtml_customer' ) )
$attr->save();

$installer->endSetup();

For details check the upgrade script mysql4-data-upgrade-1.4.0.0.7-1.4.0.0.8.php at core/Mage/Customer