Ah yes, Alice, the world's first write-only programming environment. You can save your programs, but you can't reload them later.
I've had this happen several times, and, in my case at least, it seems to be caused by something that I deleted still getting saved. In other words, it looks like Alice does not always delete things correctly. I delete something, and it seems to go away, but some part of it is still referenced in the save file, and that causes an error when attempting to reload the code later.
(Alice 2.3)
PS: Some might argue that APL was the first write-only programming language, but you'd have to be pretty old to get that joke.
