[Q] Error 7 when installing O2 1.6 (build 4399)

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http://forum.xda-developers.com/forumdisplay.php?f=698

This is where I am currently following instructions from. I have gotten to #13 under going from AT&T 1.6 (build 6601) to O2 1.6 (build 4399) then upgrading to O2 2.1 (build 8105). I am not doing anything wrong, I have tried multiple times and each time I get the error below and the Streak reboots and is still on the same build. I have tried using the search function but its not very helpful.

I get an error 7 assert failed write_raw_image issue

I just bought a new Dell Streak Today 2/9/2011

Dell Streak
Firmware version- 1.6
Baseband version- GAUSB1A111231-US
Kernal version- 2.6.29-perf
OEM version- GAUSB1A111231
Build number- 6601