Fatal error: Call to a member function toOptionArray() on a non-object in …/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php on line 463

or not found in admin -> configuration -> sm quickview

Solution:

Please go to \app\code\local\Sm\Quickview\etc\system.xml and find:

<open_effect translate="label">
<label>Open Effect</label>
<frontend_type>select</frontend_type>
<source_model>quickview/system_config_source_listeffects</source_model>
<sort_order>10</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</open_effect>
<close_effect translate="label">
<label>Close Effect</label>
<frontend_type>select</frontend_type>
<source_model>quickview/system_config_source_listeffects</source_model>
<sort_order>11</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</close_effect>

=> change to:

<open_effect translate="label">
<label>Open Effect</label>
<frontend_type>select</frontend_type>
<source_model>quickview/system_config_source_ListEffects</source_model>
<sort_order>10</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</open_effect>
<close_effect translate="label">
<label>Close Effect</label>
<frontend_type>select</frontend_type>
<source_model>quickview/system_config_source_ListEffects</source_model>
<sort_order>11</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</close_effect>

Wish you success.