Using atlas software (which uses root 5.10), we produce some ntuples. Most of them are ok but ~ 30 % have this error
(py script counting the number of events in the ntuple)
Warning in TClass::TClass: no dictionary for class AttributeListLayout is available
Warning in TClass::TClass: no dictionary for class pair<string,string> is available
SysError in TFile::Seek: cannot seek to position 4653867682515386368 in file AANnew._00001.root, retpos=-1 (Invalid argument)
Error in TFile::ReadBuffer: error reading all requested bytes from file AANnew._00001.root, got 0 of 3328120
Error in TBranchElement::GetBasket: File: AANnew._00001.root at byte:0, branch:MC_E, entry:202, badread=0
if we redo the job, it fixes sometimes the problem but not always. Is there something we can check ?