As a first step, try restarting IIS. This will cause the Vault Server to load a new tree from the database.BeginTx: Critical Error! Error in the application.
at VaultServiceBase.VaultRepository.CreateFolderReferenceCopy(Int64 nRevID, HybridDictionary hdNewRefParents, VaultFolders vfOwners, VaultFolder vfOld)
at VaultServiceBase.VaultRepository.GetReferenceCopiesByPath(Int64 nRevID, HybridDictionary hdNewRefParents, String strAbsolutePath, Boolean bRefCopyLastObjectWithAllFolders, VaultFSObjects& fsoList, Int32& nPinCount)
If you continue to get this error after an iisreset, contact SourceGear Technical Support.