It’s possible the import got disrupted for some reason. You can modify the .json file, leaving only the stations data, and just import that, see if it works. I attached the modified .json file here. It’s the original json with all sections other than “stations” removed.
Well, I got the same error about uploading file, so here is the file content:
{"stations":{"masop":[255,255,255],"masop2":[0,0,0],"ignore_rain":[0,0,0],"ignore_sn1":[0,0,0],"ignore_sn2":[0,0,0],"stn_dis":[2,128,255],"stn_spe":[0,0,0],"stn_grp":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"snames":["Lawn","Front Yard","Ferns","Retaining Wall","Driveway","Dry Creek Bed","S07 - Unused","S08 - Unused","Hill #1","Hill #2","Hill #3","Hill #4","Hill #5","Hill #6","Hill #7","S16","S17","S18","S19","S20","S21","S22","S23","S24"],"maxlen":32}}