Magento - Mage registry key "_resource_helper/core" already exists

Question

I'm migrating a magento 1.6.1 installation on my staging server, but I'm still getting the error Mage registry key "_resource_helper/core" already exists.

I migrated the db and the whole source code. Then I changed local.xml database settings.

I already ran rm -rf var/cache/* var/session/* and restarted Apache2 but can't get it working.

What should I do?

Answer 1

Yeeep! I finally got it working. The issue here was that performing the migration I also changed the <model><![CDATA[mysql4]]></model> value.

This was causing the exception... Now that I restored the default value it's all working without hacking the normal behaviour :-)