This wall set looks amazing

However, I copy everything to where it needs to go including the 'imports' to the init file
and I can not reload due to error message:
[string "Grimrock.lua"] :0: File not found: mod_assets/textures/high_temple/high_temple_arch_diff.dds
I have checked and this file is definitely where it is suppose to be (in textures??)
Anyone know what is going on here?