Hi,
the path,
vsspath="/PC/PC System/Current Version" ,
should refer to the VSS project that you want to get the files.
Ant tries to open the vss project as described in the vsspath,
Taken from ANT Documentation
username[,password] - The username and password needed to get access to VSS. Note that you may need to specify both (if you have a password) - Ant/VSS will hang if you leave the password out and VSS does not accept login without a password.
Please check this also,
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Vijay