It seems that the error banner is showing up because of the user permission.
I would recommend to check your user permission as following.
Click on the ⚙ at the top right corner
Users & Teams
Click on your user name
Click “Marketing” tab
Check if you have “Publish” and “Write” permission of “Email”
If you don’t have these, you will want to ask your Super Admin to give you the required permissions (knowledge base article: [HubSpot user permissions guide])
It seems that the error banner is showing up because of the user permission.
I would recommend to check your user permission as following.
Click on the ⚙ at the top right corner
Users & Teams
Click on your user name
Click “Marketing” tab
Check if you have “Publish” and “Write” permission of “Email”
If you don’t have these, you will want to ask your Super Admin to give you the required permissions (knowledge base article: [HubSpot user permissions guide])