I'm facing an issue with the magento backend.
Magento version 188.8.131.52
When I browse to Catalog>>Manage categories and click the manage categories link....
I'm getting this error.
Can you suggest how to sort out this issue?
It seems that you removed a custom extension from your store (or one class from the custom extension).
There are 2 ways of resolving this:
Please investigate what happened with that custom extension.