### Answer I don't have specific documentation about this exact error message ("Item org_... has been modified or is no longer in a valid state for this operation") . However, based on similar custom voice issues reported by other users, here are some steps that may help: Possible causes and solutions: 1. Voice sync issue – Your custom voice ID may no longer exist in Retell or may be pending sync. Try using the Add Custom Voice button in the builder to re-import your voice, then save and deploy your agent. [(1) ]() 2. Invalid voice reference – The voice may have been removed or is referencing the wrong voice ID. If re-importing doesn't work and you still get errors, contact support with the specific voice ID so they can manually unblock or restore it. 3. Organization state conflict – The error mentions your organization ID, which suggests there may be a state conflict at the org level. This typically requires support intervention. I'd recommend reaching out to support directly with your organization ID and voice ID for assistance: - Visit [Contact Sales]() - Visit [) Would you like me to provide a general answer on custom voice configuration?

​ To learn more, see the sources I considered: [[1] Getting "Error Not Found" when viewing agent with custom 11 labs voice](https://discord.com/channels/1186424376300679209/1382337347445723268) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.