Which version of Goldleaf are you using, and which version of Nro2Nsp are you using?
You might want to try using
THIS version of Nro2Nsp that the developer posted up in his release thread. I had some issues when trying some of the versions that were posted on his GitHub page.
Are you trying to create a RetroArch NSP or the Shutdown and Restart NSP that I posted? I uploaded my Shutdown and Restart NSP's for someone else back on page 62 in
THIS POST. You could try those if you want because I know they work for sure. If it's RetroArch that you're trying to make then I can send you mine as well if you can't get it figured out.
This won't work with newer builds. And the original RA NSP is not the same as using Nro2Nsp which creates an NSP "Shortcut" that points to the "retroarch_switch.nro", whereas the official RA NSP doesn't have an NRO. I would definitely steer clear of that original NSP.