Hi I just installed an extension from here. At first I download it and run in my localhost, it is working just fine. But when I try to install it on server, it gave me error:
Fatal error: Call to a member function toOptionArray() on boolean in **/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php on line 463
This is the files related to this issue: Config.xml
<config>
<modules>
<NG_Product>
<version>1.0.0</version>
</NG_Product>
</modules>
<global>
<helpers>
<ng_product>
<class>NG_Product_Helper</class>
</ng_product>
</helpers>
<models>
<ng_product>
<class>NG_Product_Model</class>
</ng_product>
</models>
</global>
<frontend>
<layout>
<updates>
<ng_product>
<file>NG/product.xml</file>
</ng_product>
</updates>
</layout>
<routers>
<ng_product>
<use>standard</use>
<args>
<module>NG_Product</module>
<frontName>product</frontName>
</args>
</ng_product>
<customer>
<args>
<modules>
<ng before="Mage_Customer">NG_Product</ng>
</modules>
</args>
</customer>
<catalog>
<args>
<modules>
<ng_product before="Mage_Product_CatalogController">NG_Product_Catalog</ng_product>
</modules>
</args>
</catalog>
</routers>
</frontend>
System.xml
<config>
<tabs>
<ng translate="label" module="ng_product">
<label>NG</label>
<sort_order>2000</sort_order>
</ng>
</tabs>
<sections>
<ng_product translate="label" module="ng_product">
<class>separator-top</class>
<label>Product Configuration</label>
<tab>ng</tab>
<frontend_type>text</frontend_type>
<sort_order>100</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<groups>
<link translate="label" module="ng_product">
<label>New Link Setting</label>
<frontend_type>text</frontend_type>
<sort_order>0</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<fields>
<enable translate="label">
<label>Enable</label>
<frontend_type>select</frontend_type>
<source_model>adminhtml/system_config_source_yesno</source_model>
<sort_order>0</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</enable>
<name translate="label">
<label>Link Name</label>
<frontend_type>text</frontend_type>
<sort_order>1</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<comment>Enter the name of link which you want to display in my account left navigation</comment>
</name>
</fields>
</link>
<product_required_settings translate="label" module="ng_product">
<label>Product Required Fields Settings</label>
<frontend_type>text</frontend_type>
<sort_order>1</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<fields>
<required translate="label">
<label>Required Fields</label>
<frontend_type>multiselect</frontend_type>
<source_model>ng_product/system_config_source_required</source_model>
<sort_order>1</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<comment>Select multiple fields to make them required.</comment>
</required>
</fields>
</product_required_settings>
<product_settings translate="label" module="ng_product">
<label>Add Product Settings</label>
<frontend_type>text</frontend_type>
<sort_order>2</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<fields>
<name translate="label">
<label>Name</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>1</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Name' field in add product form.</tooltip>
</name>
<sku translate="label">
<label>SKU</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>2</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'SKU' field in add product form.</tooltip>
</sku>
<description translate="label">
<label>Description</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>3</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Description' field in add product form.</tooltip>
</description>
<short_description translate="label">
<label>Short Description</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>4</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Short Description' field in add product form.</tooltip>
</short_description>
<weight translate="label">
<label>Weight</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>5</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Weight' field in add product form.</tooltip>
</weight>
<status translate="label">
<label>Status</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>6</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Status' field in add product form.</tooltip>
</status>
<url_key translate="label">
<label>URL Key</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>7</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'URL Key' field in add product form.</tooltip>
</url_key>
<visibility translate="label">
<label>Visibility</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>8</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Visibility' field in add product form.</tooltip>
</visibility>
<price translate="label">
<label>Price</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>9</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Price' field in add product form.</tooltip>
</price>
<tax_class translate="label">
<label>Tax Class</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</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>
<tooltip>select Enabled for show 'Tax Class' field in add product form.</tooltip>
</tax_class>
<meta_title translate="label">
<label>Meta Title</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</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>
<tooltip>select Enabled for show 'Meta Title' field in add product form.</tooltip>
</meta_title>
<meta_keyword translate="label">
<label>Meta Keywords</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>12</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Meta Keywords' field in add product form.</tooltip>
</meta_keyword>
<meta_description translate="label">
<label>Meta Description</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>13</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Meta Description' field in add product form.</tooltip>
</meta_description>
<qty translate="label">
<label>Qty</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>14</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Qty' field in add product form.</tooltip>
</qty>
<manage_stock translate="label">
<label>Manage Stock</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>15</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Manage Stock' field in add product form.</tooltip>
</manage_stock>
<is_in_stock translate="label">
<label>Is In Stock</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>16</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Is In Stock' field in add product form.</tooltip>
</is_in_stock>
<categories translate="label">
<label>Categories</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>17</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Categories' field in add product form.</tooltip>
</categories>
<websites translate="label">
<label>Websites</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>18</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Websites' field in add product form.</tooltip>
</websites>
<image translate="label">
<label>Image</label>
<frontend_type>select</frontend_type>
<source_model>ng_product/system_config_source_yesno</source_model>
<sort_order>19</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<tooltip>select Enabled for show 'Image' field in add product form.</tooltip>
</image>
</fields>
</product_settings>
<product_credentials_settings translate="label" module="ng_product">
<label>Credentials Settings</label>
<frontend_type>text</frontend_type>
<sort_order>3</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<fields>
<username translate="label">
<label>Soap Username</label>
<frontend_type>text</frontend_type>
<sort_order>1</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<comment>Enter username of soap api.</comment>
</username>
<password translate="label">
<label>Soap Password</label>
<frontend_type>password</frontend_type>
<sort_order>2</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<comment>Enter password of soap api.</comment>
</password>
</fields>
</product_credentials_settings>
</groups>
</ng_product>
</sections>
Appreciate your help. Thanks in advance.
