Sample2markers don't generate any pkl files, but instead generate json.bz2 files

I am going to strainphlan4 to abtain strain level data from mgs data, but when I use command sample2markers.py -i sams/*.sam.bz2 -o consensus_markers -n 8, I don’t get any pkl files, but json.bz2 files. I don’t know how to solve this problem, please help me, thanks
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I have solved. In strainphlan4.1 version, the json files replace pkl files.