Starting yesterday, whenever I try to go to admin I get the following error:

There has been an error processing your request Mage registry key "_singleton/all/update" already exists

Any idea why?

Just to clarify: this error comes up instead of the Magento admin login page, I can't login.

  • Did you try to clear your cache via commandline? – Sander Mangel Jun 24 '15 at 14:02
  • I'm sure a quick clear cache will solve your issue. – Vernard Luz Jun 24 '15 at 14:10

Delete the folder {magento_rootdir}/var/cache folder manually since you can't refresh cache from Admin panel.

  • Thank you so much! I was worried for the past 24 hours and I didn't realize it was as simple as deleting a single folder! – sdeals527 Jun 24 '15 at 14:21
  • Any idea what was causing this error? – sdeals527 Jun 24 '15 at 14:21
  • Normally I get these errors after removing/installing an extension. However it can happen anytime. – Vernard Luz Jun 24 '15 at 14:26

Take a look at https://stackoverflow.com/questions/10793897/mage-registry-key-singleton-core-resource-already-exists-in-magento

Since your admin is not working, try ssh into your server and clear your cache.

Magento keeps its cache in /var/cache located inside the Magento installation directory.

rm -fr /path-to-magento/var/cache

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