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Excel VBA code throws run-time error 429 while sending Outlook email using Task Scheduler

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I'm using Excel VBA macro to send automated emails (Outlook 2013) which runs with Windows Task Scheduler (I'm using batch file to do that) at specified time every day. When I run my macro without Task Scheduler it executes normally (emails are sent), but when I use Task Scheduler for that I receive "run-time error 429", this only happens when the VBA macro tries to create Outlook object:

Dim OutApp As Object
Dim OutMail As Object
Set OutApp = CreateObject("Outlook.Application") 'The error happens here
Set OutMail = OutApp.CreateItem(0)
On Error Resume Next
With OutMail
    .to = "[email protected]"
    .CC = ""
    .BCC = ""
    .Subject = "subj"
    .Body = "body"
    .Attachments.Add ActiveWorkbook.FullName
    .Send
End With
On Error GoTo 0
Set OutMail = Nothing
Set OutApp = Nothing

The above error only happens if the Outlook application is open on the computer. Now what I don't understand is:

  • Why does the macro work normally WITHOUT Task Scheduler (Despite Outlook being open or not) and why doesn't it work there?

  • How to make the whole process execute using Task Scheduler and not to depend on Outlook app being open or closed? (i.e. I want the macro to run no matter which applications are open/closed).

  • Advice would be highly appreciated.

    Edit: Here is the VBScript code I'm using to execute macro (in repsonse to LS_ᴅᴇᴠ's question):

        Dim WshShell
    Set WshShell = CreateObject("WScript.Shell")
    ' Create an Excel instance
    Dim myExcelWorker
    Set myExcelWorker = CreateObject("Excel.Application") 
    ' Disable Excel UI elements
    myExcelWorker.DisplayAlerts = False
    myExcelWorker.AskToUpdateLinks = False
    myExcelWorker.AlertBeforeOverwriting = False
    myExcelWorker.FeatureInstall = msoFeatureInstallNone
    ' Tell Excel what the current working directory is 
    ' (otherwise it can't find the files)
    Dim strSaveDefaultPath
    Dim strPath
    strSaveDefaultPath = myExcelWorker.DefaultFilePath
    strPath = WshShell.CurrentDirectory
    myExcelWorker.DefaultFilePath = strPath
    ' Open the Workbook specified on the command-line 
    Dim oWorkBook
    Dim strWorkerWB
    strWorkerWB = strPath & "\____DailyReport.xlsm"
    Set oWorkBook = myExcelWorker.Workbooks.Open(strWorkerWB)
    ' Build the macro name with the full path to the workbook
    Dim strMacroName
    strMacroName = "'" & strPath & "\____DailyReport.xlsm'" & "!Module1.____DailyRep"
    on error resume next 
       ' Run the calculation macro
       myExcelWorker.Run strMacroName
       if err.number <> 0 Then
          ' Error occurred - just close it down.
       End If
       err.clear
    on error goto 0 
    'oWorkBook.Save 
    'oWorkBook.Close <<--- we don't need these two because we close the WB in the VBA macro
    myExcelWorker.DefaultFilePath = strSaveDefaultPath
    ' Clean up and shut down
    Set oWorkBook = Nothing
    ' Don’t Quit() Excel if there are other Excel instances 
    ' running, Quit() will 
    'shut those down also
    if myExcelWorker.Workbooks.Count = 0 Then
       myExcelWorker.Quit
    End If
    Set myExcelWorker = Nothing
    Set WshShell = Nothing
                    @LS_ᴅᴇᴠ I was using the VBScript described here: Excel: Running Excel on Windows Task Scheduler and my batch file looked like this: start "" "D:\Documents\Macros\___\Run__Rep.vbs"
    – Iva Bazhunaishvili
                    Sep 27, 2017 at 12:42
    

    The reason which was resulting in error was that I was trying to run the task "with highest privileges":

    This was apparently not feasible in my environment, so when I unchecked it both the VBScript I was using and VBScript suggested by @Nikolaos Polygenis execute normally.

    You should first check if Outlook is running and if so, attach to it and not creating a new session:

    On Error Resume Next
    Set objOutlook = GetObject(, "Outlook.Application")    'Error if Outlook not running
    On Error GoTo 0
    If objOutlook Is Nothing Then  'Outlook not running so start it
        Set objOutlook = CreateObject("Outlook.Application")
    End If
                    Thank you for the answer. I tried to amend it your way, but unfortunately I'm getting the same error when trying to run it from Task Scheduler (otherwise it  works just fine, once again). The thing is that apparently when runing from Task Scheduler the code omitted 'GetObject ' line and threw an error at 'CreateObject' line.
    – Iva Bazhunaishvili
                    Sep 27, 2017 at 12:02
                    You are totally correct. I was running the task with "highest privileges", when I unchecked it the script executed normally.
    – Iva Bazhunaishvili
                    Sep 27, 2017 at 16:04
    

    Please follow the below:

    1) Write in an excel file which saved as SendEmail.xlsm, your Sub:

    Option Explicit
    Public Sub send_email()
    Dim OutApp As Object
    Dim OutMail As Object
    Set OutApp = CreateObject("Outlook.Application") 
    Set OutMail = OutApp.CreateItem(0)
    On Error Resume Next
    With OutMail
        .to = "[email protected]"
        .CC = ""
        .BCC = ""
        .Subject = "subj"
        .Body = "body"
        .Attachments.Add ActiveWorkbook.FullName
        .Send
    End With
    On Error GoTo 0
    Set OutMail = Nothing
    Set OutApp = Nothing
    End Sub
    

    2) Open a notepad write this Code and save it as vbs (SendEmail.vbs)

    Dim args, objExcel
    Set args = WScript.Arguments
    Set objExcel = CreateObject("Excel.Application")
    objExcel.Workbooks.Open args(0)
    objExcel.Visible = True
    objExcel.Run "send_email"
    objExcel.ActiveWorkbook.Save
    objExcel.ActiveWorkbook.Close(0)
    objExcel.Quit
    

    3) Open a notepad write this code and save as bat (SendEmail.bat),I have saved it on my desktop, you can save it everywhere you want.

    cscript "D:\desktop\SendEmail.vbs" "D:\desktop\SendEmail.xlsm"
    

    4) Create a task in the scheduler which calls the SendEmail.bat

    many thanks! Your method worked out! I was using the method described here: Excel: Running Excel on Windows Task Scheduler but it wouldn't work out as I mentioned above. I only have one question left: in the script described on the website there's given way of not quitting Excel if there are other instances running, but with your script it still doesn't quit other instnaces of Excel, should I leave it as it is, or use that checking method? – Iva Bazhunaishvili Sep 27, 2017 at 12:29 Only the instance of the script, meaning I want other instances to be left running (in case there are other instances). – Iva Bazhunaishvili Sep 27, 2017 at 12:44 Althrough your solution may work, you failed to identify OP issue and as well, you're not explaining why your answer is a solution to OP problem. – LS_ᴅᴇᴠ Sep 27, 2017 at 13:31

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