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I am trying to use the class HexEncoder from https://docs.flutter.io/flutter/convert/HexEncoder-class.html and i can't make it work. Actually i am doing this to convert a list of bytes to a string:

import 'dart:convert';
import 'package:convert/convert.dart';
HexEncoder _hexEncoder;
List<int> value = [253, 165, 6, 147, 164, 226, 79, 177, 175, 207, 198, 235, 7, 100, 120, 37]
_hexEncoder.convert(value);
but throws me the error:
 The method 'convert' was called on null
Sorry for my poor knowledge of dart/flutter. I know i amb calling a null object, i just need to know the way to use this class. Thank you so much !
import 'package:convert/convert.dart';
List<int> value = [253, 165, 6, 147, 164, 226, 79, 177, 175, 207, 198, 235, 7, 100, 120, 37];
var result = hex.encode(value);
This code
HexEncoder _hexEncoder;
just declares a variable _hexEncoder but doesn't initialize it with an encoder instance or any other value and therefor is null.
        
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