Author here, thanks for posting this!

I had an email about my LCP work a few days ago; turns out that in my desire to shoehorn everything onto a single floppy image, I removed the file 'Disk-Validator' which the Amiga uses to, um, validate disks. I thought It only needed it if there were problems with the disk structure, but apparently altering the contents of the 'Brain' file triggers a need for the disk to be revalidated. Which it can't do by itself anymore.

The workaround for now is to boot to Workbench and then insert the NewLCP disk into DF1: and let the Amiga validate the disk for you.

I'll be uploading a fixed version in the near future.