/// <summary>
        /// Method to get propane grades
        /// </summary>
        /// <param name="error">Error message</param>
        /// <returns></returns>
        public List <PropaneGrade> GetPropaneGrades(out ErrorMessage error)
        {
            var propaneGrades = _fuelPumpService.GetPropaneGrades();

            error = new ErrorMessage();
            if (propaneGrades.Count == 0)
            {
                var offSet = _policyManager.LoadStoreInfo().OffSet;
                error = new ErrorMessage
                {
                    MessageStyle = _resourceManager.CreateMessage(offSet, 38, 76, null)
                };
                return(null);
            }

            CacheManager.AddPropaneGrades(propaneGrades);
            return(propaneGrades);
        }