Hi Emmanuel, thank you for this additional information. I could reproduce the error on my end (tutorial failure) and have just checked in some fixes to psrdada: the psrdada library has been evolving and at some point it stopped understanding the old CPSR2 data files. This backward compatibility has been restored. Could you please git pull the latest version of psrdada and compile and install it? You might also need to recompile dspsr and install it again too.
dada_dbdisk backward compatible with CPSR2 data files
compile when MADV_POPULATE_WRITE is not defined
Merge branch 'master' of ssh://git.code.sf.net/p/psrdada/code
Merge branch 'master' of git://git.code.sf.net/p/psrdada/code
various small corrections
Merge branch 'master' of git://git.code.sf.net/p/psrdada/code
Merge branch 'master' of git://git.code.sf.net/p/psrdada/code