Hello,
It is good to see more users of GUN.
I wish I could help with a specific answer, but all I can really say is that the wallet should work fine.
I recommend to double check that the file name is correct and re-add what appears to be the available current nodes and try again.
There were some others having issues with the wallet a few pages back and got it figured out after some trial and error.
Maybe read back in this post and see if there are any answers there.
Wishing you luck.

addnode=seed.guncoin.info

addnode=seed2.guncoin.info

addnode=seed3.guncoin.info

addnode=104.237.4.26
addnode=138.68.108.250
addnode=142.197.219.57
addnode=158.69.248.93
addnode=172.219.124.149
addnode=172.97.140.67
addnode=172.97.246.58
addnode=173.239.232.122
addnode=173.239.232.180
addnode=173.239.232.25
addnode=176.31.126.191
addnode=184.164.129.202
addnode=188.165.194.146
addnode=204.27.59.90
addnode=47.187.117.195
addnode=51.254.45.117
addnode=52.38.228.156
addnode=73.111.137.205
addnode=74.12.138.56
addnode=78.42.198.233
addnode=94.130.14.168