On Bacula 7.0.5 version, the "purge action="" do not exist any more. There is a new truncate command that substittutes the "purge + action="" from previous versions:
Command Description
======= ===========
truncate Truncate one or more Volumes
Arguments:
volume=<vol> [mediatype=<type> pool=<pool> allpools storage=<st> drive=<num>]
Maybe you´re trying to do this in your RunScript resource:
Console = "truncate storage=FileStorage pool=Files"
Also, in previous versions, you should specify the volume name in the command:
Console = "purge volume=myvolumename action="" storage=FileStorage pool=Files"
Best regards,
Ana