Magento configswatches Call to a member function toOptionArray() on a non-object -

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i using magento 1.9.1.0 when in admin goto admin >catalog > configurable swatches

i below error

fatal error: call member function tooptionarray() on non-object in d:\wamp\www\mournewcs3\app\code\core\mage\adminhtml\block\system\config\form.php on line 463

my magento version updated 1.9 1.9.1.0

i not figure out how fix , based on online research when comment below text file "app/code/core/mage/configurableswatches/etc/system.xml"

it works fine

commented text :

                <swatch_attributes translate="label">                     <label>product attributes show swatches in product detail</label>                     <frontend_type>multiselect</frontend_type>                     <source_model>configurableswatches/system_config_source_catalog_product_configattribute</source_model>                     <sort_order>20</sort_order>                     <show_in_default>1</show_in_default>                     <show_in_website>1</show_in_website>                     <show_in_store>1</show_in_store>                     <can_be_empty>1</can_be_empty>                 </swatch_attributes>                 <product_list_attribute translate="label">                     <label>product attribute use swatches in product listing</label>                     <frontend_type>select</frontend_type>                     <source_model>configurableswatches/system_config_source_catalog_product_configattribute_select</source_model>                     <sort_order>30</sort_order>                     <show_in_default>1</show_in_default>                     <show_in_website>1</show_in_website>                     <show_in_store>1</show_in_store>                 </product_list_attribute>


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