This is written in the FAQ:
Why do I get the popup saying "Unable to verify App" or "Integrity could not be verified"?This usually means that the certificate which was used to install the app has been revoked by Apple. Unfortunately, revoking apps is up to Apple, and we can't do much to prevent revocations right now. To fix this, visit the iOSGods App or official hack topic on iOSGods and re-download the (modded) app once it has been signed with a new certificate. Alternatively, please use Sideloadly, TrollStore or iOSGods App+ to install your favorite apps.
Please read our "iOSGods Jailed App Frequently Asked Questions & Answers" topic here: https://iosgods.com/topic/85362-iosgods-jailed-app-frequently-asked-questions-answers/