"This means DM was unable to mount the selected ISO for whatever reason.
- Verify that your dump is ok, just google for the md5 hash.
- Try to install the game again (delete the old folder before)
- Your loader is using an incorrect config version"
What version USB Loaders? CFG Loader r48 or wiiflow v4.0.1 r431or USB Loader GX r1202,Replace the boot.dol in your SD or USB /apps/ usbloader_gx with the updated one. Are your USB Loader channels forwarders? Did you try from HBC first.