Not sure but somehow, when I say "reshape to 0", this happened:
i mean, why would you want to do that anyway?
it's used in my command evaluator project
Yeah, reshape (anything) to 0 should report an empty list, I guess.
On my iPad, a slightly different error message: 
Yeah, I'm not surprised, because on my computer it takes several seconds before the (invalid array length) message appears, so it's clearly stepping through some huge block of memory.