Finally this variable also fails me:
multiAttach= Directory.GetFiles(PdfPath,“*.pdf”).Concat(Directory.GetFiles(“C:\Users\Unity\Desktop\Test”,"abc.xls”)).toarray
@Lynx Hi. Can you check the double quotes(") used to enclose dd, yyyy and MM in all three assign statements. They seems to be different than that is used in PdfPath Assign statement for “Invoices”. Can you update the quotes in all other 3 assign statements for dates and check.