Open FCP 7 project in FCP 6

Hi, I'm a complete noob when it comes to FCP. I captured 8 hours of footage in FCP 7 and need to open it in FCP 6.0.6. I have read other threads on the subject but I keep getting an error. In FCP 7 I exported the footage to XLM 4 and in FCP 6 tried to import the XML.

I get the following message: ERROR: Critical errors aborted the processing an XML document. Would you like to see a log of those errors now?

When I click yes the following appears: Thu 8 Dec 2011, 11:40 - Errors Found Importing Whale and Dolphin FCP6v3.xml
: Unable to transfer data value as an audio or video parameter is out of range.( line 14846 )

Anyone have any ideas? Sorry if this has been covered somewhere else I'm stressed out so could easily have missed something simple.

Thanks in advance Dan.

Hi Stephen what I meant to say was I logged and captured the footage in FCP 7 and when I try and open it in FCP 6 it says I can't because its from a newer version.