我有一个谷歌电子表格脚本，我在定时触发器上运行，并选择在失败时接收通知。如果我手动运行它，它可以正常工作，但是当它触发时，我会收到以下通知：
启动函数错误消息触发器结束 2012 年 9 月 28 日晚上 9:45 plotPortfolioData TypeError：无法调用 null 的方法“getSheetByName”。（第 5 行）基于时间的 9/28/12 晚上 9:45
问题是，第 5 行是空的，第 4 行和第 3 行都没有任何“getSheetByName”函数
function plotPortfolioData() {
// get the Portfolio Chart sheet, and create it if it doesn't exist
var ss = SpreadsheetApp.getActiveSpreadsheet();
var portfolioDataSetT = transpose(GetComprehensivePortfolioData(ss));
varSheetName = "Charts";
// IMPORTANT
var firstIndividualStockColumn = 6; // first column in portfolioDataSetT where the actual individual holdings start
// loop through every value in the portfolio dataset and replace 0 with a blank string (this has the effect of removing
// any 0 quantity lines from the stacked charts).
for (var i = 2; i != portfolioDataSetT.length; i++) // start at i = 2 to skip the header and first row (needed for charting)
{
for (ii in portfolioDataSetT[i])
{
if (portfolioDataSetT[i][ii] <= 0)
{
portfolioDataSetT[i][ii] = '';
}
}
}
if (!ss.getSheetByName(varSheetName))
{
var newSheetCreated = true;
ss.insertSheet(varSheetName);
var sheet = ss.getSheetByName(varSheetName);
}
else
{
var sheet = ss.getSheetByName(varSheetName);
// remove all charts in this existing sheet
var charts = sheet.getCharts();
for (var i in charts)
{
sheet.removeChart(charts[i]);
}
var sheet = ss.getSheetByName(varSheetName);
}
// Build the data into the spreadsheet
var sheetDataRange = sheet.getRange(1, 1, portfolioDataSetT.length, portfolioDataSetT[0].length);
sheetDataRange.setValues(portfolioDataSetT);
// prepare the pie chart data
// start by listing the individual stock names vertically
var number_of_custom_rows = 1; // the number of manual rows we will add that are not just stocks
var pieChartSize = (portfolioDataSetT[0].length + 1 - firstIndividualStockColumn) + number_of_custom_rows; // number of holdings in the pie chart
var pieChartFirstColumn = portfolioDataSetT[0].length+1; // just start after the data pile
var pieChartStockTitles = sheet.getRange(1,1,1,portfolioDataSetT[0].length).getValues(); // the range of headers
var pieChartHoldingsRange = sheet.getRange(portfolioDataSetT.length,1,1,portfolioDataSetT[0].length);
var pieChartHoldings = pieChartHoldingsRange.getValues(); // range of holdings values
// set the pie chart holdings range number format
pieChartHoldingsRange.setNumberFormat("$#,###");
var pieChartDataSpace = sheet.getRange(1,pieChartFirstColumn,pieChartSize,2); // the space where the pie chart data will be printed for graphing (2 columns for name and holding value for each stock)
for (var i = 0; i != pieChartSize - number_of_custom_rows; i++)
{
pieChartDataSpace.getCell(i+1,1).setValue(pieChartStockTitles[0][firstIndividualStockColumn-1+i]); // add the name of the holding to the first pie chart column
pieChartDataSpace.getCell(i+1,2).setValue(pieChartHoldings[0][firstIndividualStockColumn-1+i]); // add the value of the holding to the 2nd pie chart column
}
// now add the custom rows
pieChartDataSpace.getCell(pieChartSize,1).setValue(pieChartStockTitles[0][4]); // add the cash header
pieChartDataSpace.getCell(pieChartSize,2).setValue(pieChartHoldings[0][4]); // add the cash amount
var chartHeight = 400;
var chartWidth = 500;
var offset = 3; // buffer region in pixels between charts and the edge of screen
// hide the numbers for neatness:
sheet.hideRows(1,portfolioDataSetT.length);
// performance chart (top left)
var performanceChart = sheet.newChart()
.setOption('title', "Portfolio Measurements")
.setPosition(portfolioDataSetT.length, 1, offset, offset)
.setOption('height',chartHeight)
.setOption('width',chartWidth)
.setOption('lineWidth',1)
//.setOption('vAxis.format',"$#,###")
.setOption('vAxis.gridlines.count',10)
.setOption('theme','maximized')
.setChartType(Charts.ChartType.LINE)
.addRange(sheet.getRange("A:D")) // date,cost base, cash-only,cost-base no cash
.build();
sheet.insertChart(performanceChart);
// performance chart (bottom left)
var compositionChart = sheet.newChart()
.setChartType(Charts.ChartType.AREA)
.setOption('title', "Portfolio Composition")
.setPosition(portfolioDataSetT.length, 1, offset, 2*offset + chartHeight)
.setOption('height',chartHeight)
.setOption('width',chartWidth)
.setOption('theme','maximized')
.setOption('vAxis.gridlines.count',10)
.setOption('isStacked',true)
.setOption('lineWidth',0)
.setOption('areaOpacity',0.8)
//.setOption('vAxis.format',"$#,###")
.addRange(sheet.getRange("A:A")) // dates
.addRange(sheet.getRange("E:E")) // cash balance
.addRange(sheet.getRange(1,firstIndividualStockColumn,portfolioDataSetT.length,portfolioDataSetT[0].length + 1 - firstIndividualStockColumn)) // add the individual stock holdings
.build();
sheet.insertChart(compositionChart);
// pie chart portfolio composition (top right)
var pieChart = sheet.newChart()
.setChartType(Charts.ChartType.PIE)
.setOption('title', "Portfolio Composition")
.setPosition(portfolioDataSetT.length, 1, 2*offset + chartWidth, offset)
.setOption('height',chartHeight)
.setOption('width',chartWidth)
.setOption('pieSliceText','label')
.setOption('is3D',true)
.addRange(sheet.getRange(1,pieChartFirstColumn,pieChartSize,1)) // add the individual stock names
.addRange(sheet.getRange(1,pieChartFirstColumn+1,pieChartSize,1)) // add the individual holding values
.build();
sheet.insertChart(pieChart);
// fix up number formatting
var sheetWholeRange = sheet.getDataRange();
sheetWholeRange.setNumberFormat("$#,###"); // set all numbers to currency
var sheetDateRange = sheet.getRange("A:A");
sheetDateRange.setNumberFormat("d-LLL-YYYY"); // set date column formatting
}
那么，发生了什么事，我应该如何调试这个问题？当我运行它时，它工作正常！