# Why am I receiving “1001 DNS Resolution Error” when accessing my app's subdomain?

If you receive a `cloudflare - error 1001` when trying to access a subdomain on your app, this means that you have not added the subdomain as one of your app’s domains.

Because of the way that App Platform manages DNS records, you cannot manually adds DNS records to direct subdomains to your app, such as creating a CNAME record in [DigitalOcean DNS](https://docs.digitalocean.com/products/networking/dns/index.html.md) to point at `www.example.com`. Instead, you need to [explicitly add the subdomain in your app’s settings](https://docs.digitalocean.com/products/app-platform/how-to/manage-domains/index.html.md) and ensure that your domain’s DNS is configured using either [option 1](https://docs.digitalocean.com/products/app-platform/how-to/manage-domains/index.html.md#option-1-using-digitaloceans-name-servers) or [option 2](https://docs.digitalocean.com/products/app-platform/how-to/manage-domains/index.html.md#option-2) in that doc.

## Related Topics

[How do I fix the error "Record is managed by an App on this account, and cannot be deleted"?](https://docs.digitalocean.com/support/how-do-i-fix-the-error-record-is-managed-by-an-app-on-this-account-and-cannot-be-deleted/index.html.md): Use the app’s Settings tab to remove domains associated with App Platform apps.

[Why do I get the error “JavaScript heap out of memory” during deployment?](https://docs.digitalocean.com/support/why-do-i-get-the-error-javascript-heap-out-of-memory-during-deployment/index.html.md): Increase the heap memory by setting the environment variable NODE\_OPTIONS=–max-old-space-size=4096.

[How do I fix a "permission denied for schema public" error in my dev database?](https://docs.digitalocean.com/support/how-do-i-fix-a-permission-denied-for-schema-public-error-in-my-dev-database/index.html.md): Delete the existing dev database and create a new one. Then make sure that the app deployment completes successfully.