VSS_E_WRITER_INFRASTRUCTURE is a possible indication that the Windows
2003 Volume Shadow Copy Service is not running or is an error state.
A -1 return code from applications typically means that they didn't
even have enough infrastructure present to get started.
We don't have context on your problem, as in whether this is a new
client deployment, or an older client with an unchanged configuration
whose backups worked before; or what you've investigated (TSM error
log, Windows Event Log, VSS state, etc.).

  Richard Sims