Acknowledged

Bug: Error `Value may not be initialized` when build current project

Unabled to build Datafield application with following code:
ERROR: edge1040: E:\0_development\projects\ConnectIQWorkspace\TestApps\Uninitialized\source\UninitializedView.mc:59,10: Value may not be initialized.
<iq:application id="1473ee47-9574-4c1a-8b9f-b919801ea5b3" type="datafield" name="@Strings.AppName" entry="UninitializedApp" launcherIcon="@Drawables.LauncherIcon" minApiLevel="4.2.0">
product id="edge1040"
connect iq 6.2.1
java 1.8.0_371
windows
Edition    Windows 10 Pro
Version    22H2
Installed on    ‎09/‎07/‎2020
OS build    19045.3155
Experience    Windows Feature Experience Pack 1000.19041.1000.0
-------------
import Toybox.Activity;
import Toybox.Lang;
import Toybox.Time;
import Toybox.WatchUi;

class UninitializedView extends WatchUi.SimpleDataField {

 hidden var _keyCoord as Lang.Array<Lang.Array<Lang.Number> > =
    [[]] as Lang.Array<Lang.Array<Lang.Number> >;

 hidden var _controlCoord as Lang.Array<Lang.Array<Lang.Number> > =
    [[]] as Lang.Array<Lang.Array<Lang.Number> >;

 hidden var _keys as Array<String> =
    ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"] as Array<String>;
hidden var _controls as Array<String> =
    ["<", "BCK", "DEL", ">", "INS", "CLR", "OK"] as Array<String>;

    // Set the label of the data field here.
    function initialize() {
        SimpleDataField.initialize();
        label = "My Label";
    }

    // The given info object contains all the current workout
    // information. Calculate a value and return it in this method.
    // Note that compute() and onUpdate() are asynchronous, and there is no
    // guarantee that compute() will be called before onUpdate().
    function compute(info as Activity.Info) as Numeric or Duration or String or Null {
        // See Activity.Info in the documentation for available information.
        return 0.0;
    }

function getKeyPressed_ERROR(coord as Lang.Array<Lang.Number>) as String {
      var x = coord[0] as Number;
      var y = coord[1] as Number;
    try {
     
      for (var idxKey = 0; idxKey < _keyCoord.size(); idxKey++) {
        var range = _keyCoord[idxKey] as Lang.Array<Lang.Number>;
        if (
          (range[0] as Number) < x &&
          x < (range[1] as Number) &&
          (range[2] as Number) < y &&
          y < range[3]
        ) {
          return _keys[idxKey] as String;
        }
      }
       
      for (var idxCtrl = 0; idxCtrl < _controlCoord.size(); idxCtrl++) {
        var range = _controlCoord[idxCtrl] as Lang.Array<Lang.Number>;
        if (
          (range[0] as Number) < x &&
          x < (range[1] as Number) &&
          (range[2] as Number) < y &&
          y < (range[3] as Number)
        ) {
          return _controls[idxCtrl] as String; // <-- ERROR: edge1040: E:\0_development\projects\ConnectIQWorkspace\TestApps\Uninitialized\source\UninitializedView.mc:57,10: Value may not be initialized.
        }
      }
    } catch (ex) {
      ex.printStackTrace();
    }
    return "";
  }

function getKeyPressed_OK2(coord as Lang.Array<Lang.Number>) as String {
      var x = coord[0] as Number;
      var y = coord[1] as Number;
    try {
     
    //   for (var idxKey = 0; idxKey < _keyCoord.size(); idxKey++) {
    //     var range = _keyCoord[idxKey] as Lang.Array<Lang.Number>;
    //     if (
    //       (range[0] as Number) < x &&
    //       x < (range[1] as Number) &&
    //       (range[2] as Number) < y &&
    //       y < range[3]
    //     ) {
    //       return _keys[idxKey] as String;
    //     }
    //   }
       
      for (var idxCtrl = 0; idxCtrl < _controlCoord.size(); idxCtrl++) {
        var range = _controlCoord[idxCtrl] as Lang.Array<Lang.Number>;
        if (
          (range[0] as Number) < x &&
          x < (range[1] as Number) &&
          (range[2] as Number) < y &&
          y < (range[3] as Number)
        ) {
          return _controls[idxCtrl] as String; // <-- ERROR: edge1040: E:\0_development\projects\ConnectIQWorkspace\TestApps\Uninitialized\source\UninitializedView.mc:57,10: Value may not be initialized.
        }
      }
    } catch (ex) {
      ex.printStackTrace();
    }
    return "";
  }

function getKeyPressed_OK(coord as Lang.Array<Lang.Number>) as String {
      var x = coord[0] as Number;
      var y = coord[1] as Number;
    try {
     
     
      for (var idxKey = 0; idxKey < _keyCoord.size(); idxKey++) {
        var range = _keyCoord[idxKey] as Lang.Array<Lang.Number>;
        if (
          (range[0] as Number) < x &&
          x < (range[1] as Number) &&
          (range[2] as Number) < y &&
          y < range[3]
        ) {
          return _keys[idxKey] as String;
        }
      }
       } catch (ex) {
      ex.printStackTrace();
    }
     
try{
      for (var idxCtrl = 0; idxCtrl < _controlCoord.size(); idxCtrl++) {
        var range = _controlCoord[idxCtrl] as Lang.Array<Lang.Number>;
        if (
          (range[0] as Number) < x &&
          x < (range[1] as Number) &&
          (range[2] as Number) < y &&
          y < (range[3] as Number)
        ) {
          return _controls[idxCtrl] as String; // <-- ERROR: edge1040: E:\0_development\projects\ConnectIQWorkspace\TestApps\Uninitialized\source\UninitializedView.mc:57,10: Value may not be initialized.
        }
      }
    } catch (ex) {
      ex.printStackTrace();
    }
    return "";
  }
}