Kindlepdfreader doesn't launch

hi,

After updating reader.lua due to below bug, i am unable to launch kindlepdfviewer

https://github.com/koreader/kindlepdfviewer/issues/814

as per crash.log
/mnt/us/kindlepdfviewer/kpdf.sh: line 25: ./reader.lua: not found

but reader.lua in present in root directory, just at same location as kpdf.sh.