Add some more text to error messages
Add some more text to error messages

It's still not super helpful, but it's better than before.

fhunleth/fwup,michaelkschmidt/fwup,fhunleth/fwup,michaelkschmidt/fwup,michaelkschmidt/fwup,edahlseng/fwup,fhunleth/fwup,edahlseng/fwup