# Build Error: Distribution certificate has expired

Although not common, you may have an iOS build fail if your Development or Distribution certificates have expired. These certificates have expiration dates and will need to be revoked if they are out of date.

#### Possible Cause:

1. **Your Distribution Certificate has expired.**
2. **Your Development Certificate has expired**

#### Resolution:

Remove **all but one** of these certificates in order for Adalo to be able to create a new one when uploading 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.


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