Import MIB: OIDs that were useful for PRTG: 0

Hi,

I am trying to import the MIB below for PeerLink software. I am using Importer v3.5.6. As the file content suggests, I have renamed the mib file to "psi.mib" and copied the other referenced MIB files (RFC1155-SMI, RFC1213-MIB, RFC1212) from the PRTG Program Files folder to the same location as psi.mib

I get the following message after the import completes:

Import Successful!
Sucessfully included files: 9 of 9
Sucessfully imported OIDs: 0 of 0
OIDs that were useful for PRTG: 0

Any help would be appreciated. The MIB content is...

-- MIB Definitions for PeerLink File Collaboration (Peer Software, Inc.)
-- Note: To use this file you must rename it to psi.mib.
 

   SDMIB DEFINITIONS ::= BEGIN


   IMPORTS

       enterprises, Counter, IpAddress, TimeTicks, Gauge
         FROM RFC1155-SMI
       DisplayString
         FROM RFC1213-MIB
       OBJECT-TYPE
         FROM RFC1212;

--
-- This MIB module uses the extended OBJECT-TYPE macro as
-- defined in [14];
--

   psi         	  OBJECT IDENTIFIER ::= { enterprises 733 }


--
-- Traps and Events 
--   Note: Most messages are the Prefix of a full message, where the end of 
--         the message will normally contain a file, folder or device name
--


-- Unknown or UnDefined Message (0.0)  
--
    msgUnKnownMessage TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        ""
    ::= 0

-- Standard - Non Error Messages (0.1 - 0.2)  
--
    msgStarted TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        "File Collaboration Session Started: "  
    ::= 1

    msgStopped TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        "File Collaboration Session Stopped: "  
    ::= 2
  

-- Error Messages (0.3 - 0.6)  
--

    msgSessionAborted TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        "File Collaboration Session Aborted: "  
    ::= 3

    msgFileQuarantined TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        "File Quarantined: "  
    ::= 4

    msgHostFailure TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        "Host Failure: "  
    ::= 5

    msgScanError TRAP-TYPE
       ENTERPRISE psi
       DESCRIPTION
        "Scan Error: "  
    ::= 6

   END