Did you try to run "chmod 755" on that script?
Thanks.. it works. Before that, the permission was in 644.
I tried to flash kernel v1.2.1 via TWRP and hit this error "E:Failed to sysMapFile /sdCard/kernelFileName.zip". No issue on v1.2.0 and below.
Ozcan Rom 5.0
Current Kernel version: duki99 kernel v1.2.0...