I added the menu "Invoicing/Accounting" to a user under the "Groups / Technical / Show Full Accounting Features / Menu" settings.

After this, the menu showed up in their profile and all seemed ok.

Then I noticed I couldn't make changes to any settings.  I keep getting the " RPC_ERROR Odoo Server Error" which sums down to an invalid field:

ValueError: Invalid field 'module_attachment_indexation' on model 'res.config.settings'

I tried removing the menu which was the last change prior to this error in hope it was that, but the error persists.  

How do I correct the invalid field?