Mage registry key “controller” already exists

问题

I have configured an ecommerce site using Magento, but it is throwing an error.

Mage registry key "controller" already exists

I am not sure what to do. The URL for site is http://musicademy.sweetersinging.com/store/admin

回答1:

This usually happens if you try and run Mage::run() twice - or specifically, once more after the index.php bootstrap.

Sounds like a (extremely) badly written 3rd party extension or template. It (sadly) wouldn't be the first time I've seen someone execute this within a .phtml file.

Go through the standard debug process, refresh between each.

1. Move app/code/local to app/code/local.bak
2. Move app/code/community to app/code/community.bak
3. Move app/design/frontend/your_custom_package to app/design/frontend/your_custom_package.bak

Once you've found the cause above, then you can start to filter through the filters/dirs to check.

回答2:

If you have Magefirewall extension installed try disabling at the webserver(by going to magento_root_dir/app/etc/modules/magefirewall.xml) and clear the cache (by deleting all the files/folders in magento_root_dir/var/cache/) if you don't have access to the admin panel. Doing this solved the issue for me on Magento CE 1.9.2.2.

来源：https://stackoverflow.com/questions/9737069/mage-registry-key-controller-already-exists