issues with clrmamepro and chd files

[InsanePoetry]

first off, i really know nothing about this stuff other than what ive been able to gather from the walkthroughs and such which still leaves a vast void of knowledge. i recently downloaded some chd files and while trying to scan/rebuild with clrmamepro, its tells me "Gauntlet Dark Legacy (version DL 2.52) [size: 544kb]
no or corrupt chd header/sectormap: gauntdl.chd [chd-md5: N/A] [chd-sha1: ba3af48171e727c2f7232c06dcf8411cbcf14de8]
unneeded file: F:\Emulators\roms build 133\gauntdl\gauntdl.chd" it says that for all 300 some chd files. any ideas as to what im doing wrong or how i might go about fixing this?