a quoted string is expected

[Giuseppe Sacco]

Hi,
I am using amanda 2.5.1p2 and getting this error:

"/usr/local/etc/amanda/savio/amanda.conf", line 400: a quoted string is expected
amgetconf: errors processing config file 
"/usr/local/etc/amanda/savio/amanda.conf"

since when I added the line 400
        auth bsdtcp
in this block:
define dumptype global {
    comment "Global definitions"
    # You may want to use this for globally enabling or disabling
    # indexing, recording, etc.  Some examples:
    index yes
    # record no
    auth bsdtcp
}

I get the same error if I write it in this way:
        auth "bsdtcp"

What am I doing wrong?

Thanks,
Giuseppe