error with geomap in googleVis

Hi All,

I am unable to get the plot geomap in googleVis package. data is as follows

head(index.ret)

    country    ytd
1 Argentina -10.18
2 Australia  -3.42
3   Austria  -2.70
4   Belgium   1.94
5    Brazil  -7.16
6    Canada   0.56

map1 = gvisGeoMap(index.ret,locationvar = 'country', numvar = 'ytd')
plot(map1)

But it just displays a blank page, showing an error symbol at the right
bottom corner. I tried demo(googleVis), it also had a similar problem. The
demo showed all other plots/maps except for those geomaps. Could any one
please hint me what/where could be the problem? Many thanks for the idea and
support. 

Regards,

SNV Krishna

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