(Sorry if my english is bad, but is not my language)
My Magento version is 1.9.3.8
I tried to solved this error whit this in SSH:
php -f shell/compiler.php disable
php -f shell/compiler.php clear
php -f shell/compiler.php compile
But didnt work (with compile, and without it).
This is my config.xml:
<?xml version="1.0"?>
<config>
<modules>
<Mage_Gextorshop>
<version>0.0.1</version>
</Mage_Gextorshop>
</modules>
<global>
<models>
<mage_gextorshop>
<class>Mage_GextorShop_Model</class>
</mage_gextorshop>
</models>
<helpers>
<mage_gextorshop>
<class>mage_gextorshop_Helper</class>
</mage_gextorshop>
</helpers>
<events>
<sales_order_save_commit_after>
<observers>
<mage_gextorshop>
<class>mage_gextorshop/observer</class>
<method>logUpdate</method>
<type>singleton</type>
</mage_gextorshop>
</observers>
</sales_order_save_commit_after>
</events>
</global>
</config>
In LocalHost had the same problem and when I used the SSH commands, solved it.
Also I uninstalled the custom module, used SSH commands and installed again the module but error continue.
Other similar questions that I found didnt help me.
Best Answer
Try this: