[Solved] addTab in adminhtml_sales_order_view: “Invalid Blocktype: Mage_…”

by


AdminModifications -> MyNamespace_AdminModifications

        <action method="addTab">
            <name>order_custom</name>
            <block>MyNamespace_AdminModifications/adminhtml_sales_order_view_tab_custom</block>
        </action>

because

<blocks>
  <MyNamespace_AdminModifications>
    <class>MyNamespace_AdminModifications_Block</class>
  </MyNamespace_AdminModifications>
</blocks>

Tip for the future: if you ever see magento trying to load Mage_* class instead of your class – 99% that you have an error in your config.xml file or typo in calling a block/model/helper by config name (like <MyNamespace_AdminModifications> in this case)

1

solved addTab in adminhtml_sales_order_view: “Invalid Blocktype: Mage_…”