etcupdate: Failed to build new tree

Hello,

Last update I have some issues with etcupdate:

etcupdate warning: "No previous tree to compare against, a sane comparison
is not possible."

That I corrected with:

etcupdate extract
etcupdate diff > /tmp/etc.diff
patch -R < /tmp/etc.diff
(etcupdate diff doesn't show any diffs.)

Today I've just updated current and etcupdate -p gives:

"Failed to build new tree"

What might be wrong?

Thanks
Nuno Teixeira