Help with rtx-shredder cli?

I’m trying to delete all tickets from a queue using ./rtx-shredder
–plugin “Tickets=query, Queue = ‘SpamQueue’” --sqldump
/var/backups/deletedtickets.sql and am receiving this somewhat terse
error:

SQL dump file is '/var/backus/deletedtickets.sql’
Couldn’t load plugin
Error: Plugin doesn’t support argument(s): queue = ‘Spam’

What am I doing wrong here?