Manage Category page shows this error

[blservices]

I'm facing an issue with the magento backend.

Magento version 1.8.1.0

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?

- Arnab

[Gabriel Guarino]

 Hi @blservices,

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:

• Restore the missing code
• Remove the source model from your database

Please investigate what happened with that custom extension.

Best regards.
Gabriel

[Pronto]

Or more likely you removed an extension, but didn't remove the attributes it added.