TBasket problem reading TMVA file

Hi to everyone,
I am trying to read a file from TMVA output (which stores some variables in a simple TNtuple), but it reports always this error:

[quote]R__unzip: error in the header
Error in TBasket::ReadBasketBuffers: Inconsistency found in header (nin=0, nbuf=0)[/quote]

When I look to the TNtuple structure I find a Tree Compression Factor of -32000. Is there anything that I can do?
I am running ROOT 28.00c (and cannot change it).


It somehow look like the file is corrupted and/or was not produced correctly. A priori either the producing code did not run to completion or there is serious issue (memory over-write, etc.) in the producing code (Check using valgrind).