Getting file not found error

Here are a few functions I have used.  I use aqFile.Exists to check the file path.  If the sheet you are referring to does not exist this may cause the same or a similar issue.  See if any of this helps. It is JavaScript.  I am not sure what you are using but you can pick out the methods here and look them up to find equivalent calls.   Good Luck!!

  if (!aqFile.Exists(_fileName))
  {  
    // Create a new Excel file and add a new empty sheet to it
    Log.Message(aqString.Format("The %s file does not exist and will be created.", _fileName));
    excelFile = Excel.Create(_fileName);
    excelSheet = excelFile.AddSheet(_sheetName);
    excelFile.Save();
  }  
  
  if (aqFile.Exists(_fileName))
  {
    // Open the existing Excel file
    excelFile = Excel.Open(_fileName);

    if(SheetWithTitleExists(excelFile,_sheetName) == false)
    {
      excelSheet = excelFile.AddSheet(_sheetName); 
    }
    else
    {
      excelSheet = excelFile.SheetByTitle(_sheetName);    
    }
    
    Object.entries(_valuesObj).forEach(([key, value]) => 
    {
      if(excelSheet.RowCount == 0)
      {
        // Write the header row
        Object.entries(value).forEach(([key, value]) =>
        {
          //Write Line Item Values to rows. 
          let cellData = "";
          Object.entries(value).forEach(([key, value]) =>
          {
            cellHeader = key;
            cellData = value;

          });
          excelSheet.Cell(key, 1).Value = cellHeader;        
          excelSheet.Cell(key, 2).Value = cellData;
        });
      }
      else
      {
        rowIndex = excelSheet.RowCount + 1;      
        Object.entries(value).forEach(([key, value]) =>
        {
          //Write Line Item Values to rows. 
          let cellData = "";
          Object.entries(value).forEach(([key, value]) =>
          {
            cellData = value;
          });
          excelSheet.Cell(key, rowIndex).Value = cellData;        
        });
      }
    });  
  }
  // Save the file to apply the changes
  excelFile.Save();
  //Excel.Close(fileName);
}

function SheetWithTitleExists(_fileName,_sheetName)
{
  if (! equal(_fileName, null))
  {
    if (_fileName.SheetCount > 0)
    {
      for (let i = 0; i < _fileName.SheetCount; i++)
      {
        if (equal(_fileName.SheetByIndex(i).Title, _sheetName))
        {
          return true;
        }
      }
      return false;
    }
    else
    {
      return false;
    }
  }
}