GeometryConstructors.Polygon: LinearRing requires at least 3 points - google-earth-engine

Question

I am trying to run the following code to extract the change map using the Land Trendr algorithm in Google Earth Engine. Everything seems to be running fine when I use a point as my area of interest, but once I try to use a polygon as my aoi file it throws me an error. I am attaching my code here :
//##########################################################################################
// START INPUTS
//##########################################################################################
// define collection parameters
var startYear = 1985;
var endYear = 2017;
var startDay = '06-20';
var endDay = '09-20';
//var aoi = ee.Geometry.Point(-122.8848, 43.7929);
var coords = ([70.9361058400289,28.387332974875402],
[83.5044652150289,28.387332974875402],
[83.5044652150289,37.305336609850876],
[70.9361058400289,37.305336609850876],
[70.9361058400289,28.387332974875402]);
var aoi = ee.Geometry.Polygon(coords);
var index = 'NBR';
var maskThese = ['cloud', 'shadow', 'snow', 'water'];
// define landtrendr parameters
var runParams = {
maxSegments: 6,
spikeThreshold: 0.9,
vertexCountOvershoot: 3,
preventOneYearRecovery: true,
recoveryThreshold: 0.25,
pvalThreshold: 0.05,
bestModelProportion: 0.75,
minObservationsNeeded: 6
};
// define change parameters
var changeParams = {
delta: 'loss',
sort: 'greatest',
year: {checked:false, start:2000, end:2010},
mag: {checked:true, value:200, operator: '\>', dsnr:false},
dur: {checked:true, value:4, operator: '\<'},
preval: {checked:true, value:300, operator: '\>'},
mmu: {checked:true, value:11},
};
//##########################################################################################
// END INPUTS
//##########################################################################################
// load the LandTrendr.js module
var ltgee = require('users/emaprlab/public:Modules/LandTrendr.js');
// add index to changeParams object
changeParams.index = index;
// run landtrendr
var lt = ltgee.runLT(startYear, endYear, startDay, endDay, aoi, index, [], runParams, maskThese);
// get the change map layers
var changeImg = ltgee.getChangeMap(lt, changeParams);
// set visualization dictionaries
var palette = ['#9400D3', '#4B0082', '#0000FF', '#00FF00', '#FFFF00', '#FF7F00', '#FF0000'];
var yodVizParms = {
min: startYear,
max: endYear,
palette: palette
};
var magVizParms = {
min: 200,
max: 800,
palette: palette
};
// display the change attribute map - note that there are other layers - print changeImg to console to see
Map.centerObject(aoi, 11);
Map.addLayer(changeImg.select(['mag']), magVizParms, 'Magnitude of Change');
Map.addLayer(changeImg.select(['yod']), yodVizParms, 'Year of Detection');
// export change data to google drive
var region = aoi.buffer(1000).bounds();
var exportImg = changeImg.clip(region).unmask(0).short();
Export.image.toDrive(
{image: exportImg,description: 'lt-gee_disturbance_map',
folder: 'lt-gee_disturbance_map',
fileNamePrefix: 'lt-gee_disturbance_map',
region: region,
scale: 30,
crs: 'EPSG:5070',
maxPixels: 1e13});
It is throwing an error: Line 75: GeometryConstructors.Polygon: LinearRing requires at least 3 points. I am not sure what I am doing wrong here. Thank you for your help.