This error occurs when the uninstalling user does not have access to the dataflows in Einstein Analytics. To resolve this, temporarily grant access to Einstein Analytics:
1. Create a permission set with selecting license "Sales Analytics Apps"
2. Check following permissions in System Permissions
3. Assign it to admin user who's trying to uninstall the package.
4. Attempt the uninstall again.
You may also be able to review the existing permission sets in your org to grant one that provides the same access.
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