Google Assistant - extra keys not allowed @ data['google_assistant']

I’m having an issue when trying to “Check Configuration” after adding some code to the file editor. I get this error extra keys not allowed @ data['google_assistant']. I followed a tutorial on how to manually set Google Assistant up, I’m pretty sure I followed everything correctly. I did have a thought, I used the same Google Cloud Project to set up Google Assistant that I used to set up my Nest devices in HA, maybe there’s conflicting or extra keys?

I’m completely new to HA so any help would be appreciated. Thanks!