Separating two lists within single object using ui.chart.array.values

Question

I have the code below, however, when I try to plot my chart, I am getting one error message. I believe this is related to the fact that within my object VIIR2014List I have two lists, one for average radiance, another for coordinates.
How can I get rid of this error message?
////////////////------------------------------------------------ VIIRS DATA
var VIIRS = ee.ImageCollection("NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG");
VIIRS = VIIRS.select('avg_rad');

var latLon = ee.Image.pixelLonLat().select('longitude');

var VIIRS2014 = VIIRS.filterDate('2014-1-1','2015-1-1').mean().addBands(latLon);
var VIIRS2019 = VIIRS.filterDate('2019-1-1','2020-1-1').mean().addBands(latLon);

var VIIR2014List = VIIRS2014.reduceRegion({
  reducer: ee.Reducer.toList(),
  geometry: mydiagonal,
  scale: 1000,
  maxPixels: 1e9
});

print (VIIR2014List, "Lists 2014"); /// 2014

var VIIR2019List = VIIRS2019.reduceRegion({
  reducer: ee.Reducer.toList(),
  geometry: mydiagonal,
  scale: 1000,
  maxPixels: 1e9
});

print (VIIR2019List, "Lists 2019"); /// 2019

Kuik · Accepted Answer

The returned object is an ee.Dictionary(). Get the single list values from the dictionary and plot these as follows:

// subset the lists
var lon = ee.List(VIIR2014List.get('longitude'))
var avgRad = ee.List(VIIR2014List.get('avg_rad'))
var chart = ui.Chart.array.values(avgRad, 0, lon )

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Separating two lists within single object using ui.chart.array.values

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