Allow only one checkbox to be checked when the boxes are placed in specific cells a range

Please help me. I need a simple script for Google Sheets to allow only one of 6 checkboxes to be checked at a time

   function onEdit(e) {

   var ss = SpreadsheetApp.getActiveSpreadsheet();
   var activeSheet = ss.getActiveSheet();
   var range = e.range;
   var CHECKBOX_CELLS = ["H1:H6"];
   var checkboxIndex = CHECKBOX_CELLS.indexOf(range.getA1Notation());

   if (activeSheet.getName() !== "TRIAL" VcheckboxIndex > -1 && range.getValue() == true) 
   {
    var sheet = range.getSheet();

    for (var i=0; i<CHECKBOX_CELLS.length; i++) {
    if (i==checkboxIndex) continue;

    sheet.getRange(CHECKBOX_CELLS[i]).setValue(false);
    }