String method tutorial - no output file produced

[krl52]

I'm trying to follow this tutorial in abinit: https://docs.abinit.org/tutorial/paral_images/

When trying to run abinit for any of the tstring files, no output file is produced. For instance, I copy the files tstring_01.in and tstring.files into the subdirectory work_paral_string, edit the tstring.files with the appropriate file names, and run the command mpirun -n 20 abinit < tstring.files > log 2> err. No error message is shown but also no output is produced. (The expected output file would be tstring_01.out.)

Any suggestions?
Thanks