Mage registry key “_singleton/core/resource” already exists in magento

Question

I am facing this problem on my site Mage registry key \"_singleton/core/resource\" already exists, Please help me how to solve this error.

I have checked the folder and

Answer 1

I stumbled upon this problem before, and this was because of the cache. if you could still access the Magento Admin panel, go and flush your Cache Storage (the two main buttons near the top of the System -> Cache Management page).

You can also refer to this blog post for more help on the cache problem.