# Build Error: You have reached the maximum number of certificates

Although not common, you may have an iOS build fail if you have too many Development or Distribution certificates. Each Apple Developer Account requires only one Development and one Distribution certificate to build all your apps. If you have other apps dependent on your iOS certificates (even if non-Adalo) they will not be interrupted by revoking any unnecessary certificates, as long as the certificates are generated again by Adalo.

#### Possible Cause:

1. **You have more than two Development or two Distribution Certificates in your Apple Developer Account:** This will prevent us from creating a new one if we are unable to use the ones that exist on the account.

#### Resolution:

Remove **all but one** of these certificates in order for Adalo to be able to create **one** so that we are able to upload this app to TestFlight (there can be a maximum of 2).<br>

To do this, please follow these steps:

1. Go to your [iOS Developer Account](https://developer.apple.com/account/ios/profile/profileList.action?type=production)
2. Click on **Production** under the **Certificates** menu.
3. Click on the **iOS Distribution** certificate that is about to expire.
4. Click **Revoke.**
5. Click **Revoke** to confirm that you want to revoke the certificate.
6. Go back to Adalo and create a new build for your iOS app. This will generate a fresh certificate.