_IETagNameGetCollection error set for index value -1

[Sshahr]

Hi All

Thanks in advance for looking into this and admitting this is my first ever coding attempt not only in Autoit but in any language. Please pardon my ignorance.

Now to the issue, I am working on a Service Delivery system where I simply need to put in a service request number in a portal and click submit to go to the next page. There are a bunch of checkboxes in that page and some other information. Based on those information I would tick one or two check boxes and submit the form. There is no iframe. now I have used _IEFormElementCheckBoxSelect initially but got error exactly on the third iteration with service requests where, it cannot find the IE object. I tried using Sleep, _IEloadwait, Winwait, Winactivate etc no luck.

So, I decided to use another method and here is the code snippet

===================================================

$aServiceRequest = [req1, req2, req3, req4]

(i run the loop on the above array)

Select
         Case $aPM <>"" And $aPMDel ==""
            If $aAccessType = "<some test text>" Then
               WinActivate ("<portal>")
               Local $CARS = _IEAttach ("<portal>")
               Local $oForm1 =  _IEFormGetObjByName($CARS, "thisform")
               Local $oQuery1 = _IEFormElementGetObjByName($oForm1, "grp")
               _IEFormElementSetValue($oQuery1, "43809")
               Local $oSetButton = _IEFormElementGetObjByName($oForm1, "btn_changeSG")
               _IEAction ($oSetButton, "click")
               _IELinkClickByText ($CARS, "<some text>")
               Local $PMIndex = _ArrayBinarySearch($carsPM, $aPM, 0)
               Local $aPMID = $carsPM [$PMIndex][1]
                  If Not @error Then
                     Local $CARSChild = _IEAttach("<portal title>")
                     Local $oForm2 =  _IEFormGetObjByName($CARSChild, "thisform")
                     _IELoadWait ($oForm2)
                     Local $oInputs = _IETagNameGetCollection($CARSChild, "input")
                     For $oInput In $oInputs
                        If $oInput.name = $aPMID Then
                           MsgBox (0,0, "Match is made")
                           _IEAction ($oInput, "click")
                           ExitLoop
                        EndIf
                     Next

.

.

EndSelect

The first two run of the loop is fine and does everything but on the third run, it gives me the below error

 

IE.au3 (1811) : ==> The requested action with this object has failed.:

Return SetError($_IESTATUS_Success, $oTemp.GetElementsByTagName($sTagName).length, $oTemp.GetElementsByTagName($sTagName))
Return SetError($_IESTATUS_Success, $oTemp^ ERROR
>Exit code: 1    Time: 108.4

Could I please get some help to understand this error and possibly an indication of what I am doing wrong?

many thanks