microsoft.biztalk.interop.ssoclient error

I was trying to configure biztalk 2013 sftp adapter and was getting this error in EventLog
Reason: "System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.BizTalk.Interop.SSOClient, Version=7.0.2300.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
It turns out that there is no BizTalk Interop SSOClient in the GAC

 
C:\Windows\system32>gacutil -l | find "Microsoft.BizTalk.Interop.SSOClient" 
  Microsoft.BizTalk.Interop.SSOClient, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL 
  Microsoft.BizTalk.Interop.SSOClient, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 

I resolved this problem by finding ESSO on Biztalk DVD and manually upgrade SSO and this resolved the problem :

 
C:\Windows\system32>gacutil -l | find "Microsoft.BizTalk.Interop.SSOClient" 
  Microsoft.BizTalk.Interop.SSOClient, Version=7.0.2300.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL