Some errors and warnings using rtmpdump

[vegetablesalad]

home@home-desktop:~$ rtmpdump -c -r "rtmpe://195.13.206.153/live/mp4:ltv_lv_hq.stream"
RTMPDump v2.4
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
WARNING: gnome-keyring:: couldn't connect to: /tmp/keyring-LCZthe/pkcs11: No such file or directory
ERROR: You must specify a hostname (--host) or url (-r "rtmp://host[ort]/playpath") containing a hostname

First question is - I can only use host name ?
And what is that warning ?

Thanks for any help

[svnpenn]

-c requires a parameter

--port|-c port          Overrides the port in the rtmp url