Update

Author: Napattnpp

Code.gs

@@ -1,4 +1,4 @@
-/**------------------------------------------- Function is runed when get HTTP GET request -------------------------------------------**/
+/**------------------------------------------ Function is runed when HTTP GET request occur ------------------------------------------**/
 function doGet(e) {
   var message;
   var date = new Date();

FileTools.gs

@@ -40,9 +40,9 @@ var FileTools = class FileTools {
 
       // Check sheet name
       var spreadsheet = SpreadsheetApp.openByUrl(spreadsheetUrl);
-      var activeSheet = spreadsheet.getSheets();
+      var activeSheetList = spreadsheet.getSheets();
 
-      if (activeSheet.every(sheet => sheet.getName() != sheetName)) {
+      if (activeSheetList.every(sheet => sheet.getName() != sheetName)) {
         // Create a new sheet (For a new day)
         spreadsheet.insertSheet(sheetName);