ERROR: Function failed: do_rootfs

Hi,
I'm new this forum - this is my first post.
I own a VU+ Solo and I would like to build the image myself as I later would like to start to do modifications to the software and adapt some packages to my needs.
So I setup a build environment in an Ubuntu 12.04 chroot enviroment according to a description which is available here in the forum; checked out the code from git at sf.net.

Now I got following message near to the end of the build process:
ERROR: Function failed: do_rootfs

It's stated that I should have a look at the file /home/openpli30/openpli-openpli-oe-core/build-vusolo/tmp/work/vusolo-oe-linux/openpli-enigma2-image-1.0-r0/temp/log.do_rootfs.10826 ( which I attached ). I can't find the root cause for the error message.

Would you please point me into the right direction and let me know what I miss ?

thanks,

lt-commander-data