Having issues with EPDM API that are boggling:

Here's a snippit:

' get the source file

aFile = vault.GetFileFromPath("C:\PDM_Vault\old_file.sldprt")

aPos = aFile.GetFirstFolderPosition

aFolder = aFile.GetNextFolder(aPos)

' copy the file to a new filename in the same folder

bfileID = aFolder.CopyFile(aFile.ID, aFolder.ID, Me.Handle.ToInt32(), "new_file.sldprt", 0)

bfile = vault.GetFileFromPath("C:\PDM_Vault\new_file.sldprt")

' eveything seems to look like it's working

' got both afile and bfile

' got both id's

' file appears to be in the vault (in windows explorer in Private state)

'

'now let's check it in

bfile.UnlockFile(Me.Handle.ToInt32(), "Copy of original file")              

This last statement throws an error:

E_EDM_FILE_NOT_FOUND    0x80040213  The file could not be found

Anybody got any advice?  I'm at my wits end...