Error: Time has run out while waiting for the user's response

Trying to send several Mails triggers this error. How can I start fixing the error that says: "Time has run out while waiting for the user's response". Sometimes it works and sometimes the bug does not come out.

This is my code:

function onEdit(evt){
  var range=evt.range;
  var ui = SpreadsheetApp.getUi();

  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var worksheet   = spreadsheet.getSheetByName("Respuestas de formulario 1");
  var texto=worksheet.getRange( range.getRow(),range.getColumn()).getValue();//numero gestores para iniciar bucle//

  //si es fila 26//
  if(range.getColumn()==26){


  //averiguamos cuantos admins hay
  var style = get_status(texto);
  worksheet.getRange( range.getRow(),range.getColumn()).setValue(texto).setBackgroundColor(style[0].color);


  var admins=list_admins(worksheet.getRange('E'+ range.getRow()).getValue());
  var nnotificados=admins.length; 
   var response = ui.alert('Desea notificar al remitente vía mail', ui.ButtonSet.YES_NO);

    // Process the user's response.
    if (response == ui.Button.YES) {
      Logger.log('Enviaron a:');
      for (var i=0;i<nnotificados;i++){
       // ui.alert(template_change_status(admins[i],range,worksheet,style[0].color));
        //si el asunto es finzalizada no lio
        var asunto="";

        if("Finalizado Cargue al LMS" == worksheet.getRange('Z'+ range.getRow()).getValue()  ){
          asunto=worksheet.getRange('Z'+ range.getRow()).getValue();
        }else{
          asunto=worksheet.getRange('Z'+ range.getRow()).getValue()+" N: "+worksheet.getRange('AC'+ range.getRow()).getValue()+ " Ficha: "+worksheet.getRange('D'+ range.getRow()).getValue()+ " Ticket: "+worksheet.getRange('X'+ range.getRow()).getValue();
        }

        MailApp.sendEmail({
          to:admins[i].email,
          subject:asunto,
          htmlBody:template_change_status(admins[i],range,worksheet,style[0].color)
        });


      }
    }
  }
}