My wife and I are trying to do a lan world. We fixed the original java error of 0 in 0 out, but now we're getting "Internal Exception: Java.lang.IllegalArgumentException: Itemstack ingredients cannot be created using the empty ingredient."

latest.log

To be clear, we deleted the logprot mod as directed.

Not sure what the issue is, but if you make a dedicated server following this - AllTheGuides - it works fine.