You are mistaken. That unspent output was received at moDNytfZa69vc2Hz1ELjPaSJ2DheWiCjT6 (not at mvNAGP5nNef6MHfB6Tcu426MJboBqrwJZV). See where it says "address" in the output?
Wrong private key. You needed to run:
dumpprivkey moDNytfZa69vc2Hz1ELjPaSJ2DheWiCjT6
THanks, going to try again.