This page will assist you with the following error:
Facebook Ads Error: Business Management Permissions Are Required to Access This Field
Cause
Power My Analytics' app has not been given sufficient permissions from your Facebook account and cannot access the information in the API.
Solution
Log into your Facebook account. Select Settings & Privacy from the dropdown menu in the upper right corner.
Then select Settings.
Select Business Integrations from the left navigation pane. Find Power My Analytics then click View and Edit.
Enable Manage your Business.