getting error while trying to flash my neo freerunner

[Detructor]

I've used the command out of the wiki...for example
"sudo ./dfu-util -a rootfs -R -D ./Om2008.8-gta02-20080904.rootfs.jffs2"

I'm using the standard terminal from gnome

        Hey guys,
        
        I hope you can help me, I've the following problem:
        
        When I try to flash the neo on my laptop I get a
        "Starting download: [dfu_download error -71"
        
        sometimes the download starts and then I get the error.
        
        When I get the neo in June, I could flash it without getting this error.
        
        My operating system: Ubuntu 8.04.1
        
        I ask here, because I can't find anything about this error in the www
        (only 3 entries in google and none of it helps).
        
        hope for help
        Detructor
        
        ======================
        
        Hi,
        
        What command line did you use? One cause of this error is when you give 
        the wrong argument to dfu-util, e.g. -a u-boot while flashing a kernel 
        image.
        
        Michael