The initial impression is that it might be a problem with a customization or addition in your Odoo environment when the fields are being retrieved of a model.
See for example:
- What is KeyError? | Odoo
- KeyError: 'crm.phonecall' | Odoo
- Keyerror/ Odoo crashes after app install. Where is the error? | Odoo
Recommendation is to check customizations made using Odoo Studio in collaboration with your Odoo implementation partner. Please follow your organization’s procedure for altering your Odoo-environment in case you want to test changes.