Hello!
Welcome to the VASP forum! I am sorry you are experiencing this issue when running through the tutorials. Fortunately, after trying various compilers and settings I could ultimately reproduce the error and I hope I can give you some useful advice. I believe there is indeed a bug when writing ML_FFN files in case the code was compiled without scaLAPACK. There seems to be an inconsistency between the file output and what is expected when reading in. To be honest, we rarely tested the LAPACK-only (no scaLAPACK) version of the code in the past since there are usually only disadvantages without scaLAPACK and we highly recommend to use it if available.
To confirm that my findings apply to your case, could you please send me your makefile.include and tell me which compiler you used? I suspect that the -DscaLAPACK flag is missing in the makefile.include file?
Did you avoid scaLAPACK on purpose? If not, I would just suggest to recompile VASP with scaLAPACK: basically, use one of the makefile.include templates from the arch directory and try to recompile the code (do not forget make veryclean to clean up first). If you experience problems, please post them here again! Unfortunately, you will need to recreate the ML_FFN files with the new executables before continuing with the tutorials.
Hope this helps!
All the best,
Andreas Singraber
