No StreamerInfo found in files with 5.34/07

ROOT
1

Hi

Migrating to 5.34 I have issues reading files I created with 5.32

Warning in <TFile::Init>: no StreamerInfo found in TMVAMulticlassApp.root therefore preventing schema evolution when reading this file.
Opened input file: TMVAMulticlassApp.root: 0x10fdc800

I see some similar posts but not really an answer…

Thanks

Alex