Lock_Mode INI variable has illegal value. Assuming Native.
This warning has the following cause and solution:
VSS can be set up to use its own form of file locking. This is set by the VSS Administrator adding a Lock_Mode = INI file setting to the SRCSAFE.INI file. At the present time, the setting is incorrect.
Edit the SRCSAFE.INI to correct the Lock_Mode INI file setting to be either Native or Lockfile.