[Rails] undefined method `tab' for radiant

Hi all...

I am new to radiant cms. I have tried to install blog and liveblog
extensions. But in both cases I got the following error.

rake aborted!
undefined method `tab' for #<BlogExtension:0xb6dc23e4>

and

rake aborted!
undefined method `tab' for #<LiveblogExtension:0xb6dc23e4>

Any idea? I am using radiant 0.8.1

Thanks
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