I have run across an error during a lifecycle state change of "Object Must Implement IConvertable". I did find info on this issue on Cracking the vault blog (thank you) however I do not see any service patch or Hot fix in the Vault/ADMS 2012 support area that seems to address this issue.
The system producing the error is Vault Workgroup 2012, Has a Hot fix or one of the service patches, upgrades or updates for 2012 ADMS address this?
It appears this issue was addressed in 2013 but has not yet been resolved in 2012. I believe this is intended to be addressed with a future hotfix but do not at the moment have a time frame for delivery.