[Discuss-gnuradio] Dial Tone.grc problem

Hi,

I have created the flow graph as mentioned in this video
http://www.youtube.com/watch?v=xxe87CdIq-s
I get the following error gr_vmcircbuf_createfilemapping: createfilemapping
is not available

I am running GNU radio on Ubunutu 10.10 on Oracle VM Virtual Box.
I am using USRP N210.

Could someone please suggest me how to get rid of this error.

Regards,
Bannu
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