can't boot to graphic mode

[nplong]

i have a bt4 pre final dvd and my dvd is okie.
But it boot to dragon screen with some option (choose to start bt4 from livecd or etc.)
when i choose the one, it show:
ext-fs:sda3: couldn't mount beacause of unsupported optional features (240)
So what does this error means and how can i do now ?
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ps. sorry for my bad english.

[ripon]

search forum. Your answer will get.