PS3 Having trouble with Webman Classics Maker

[heythanks5]

Hi all.

I'm trying to create shortcuts for my ISOs directly to XMB and this appears to be the only way to do that. I have followed the instructions but when I try to run the build, I keep getting this error:

[1/5] Execution of 'json_to_param_sfo.py': DONE
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[2/5] Execution of 'content_id_elf_replace.py': DONE
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[3/5] Execution of 'edit_launch_txt.py': DONE
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DEBUG content_id: UP0001-WLUS30888_00-0000000000000000
'C:\Users\User\Desktop\ps3\ps3' is not recognized as an internal or external command,
operable program or batch file.
[4/5] Execution of 'resign_eboot.py': FAILED
FileNotFoundError(2, 'No such file or directory')

Does anyone have any clue what I'm doing wrong?