Error On Second Iteration: Application-defined or object-defined error - vba

Question

This year I inherited support of about a dozen accdb applications in Office 2010 Win 7 that often manipulate external excel files.
I keep getting the same error scenario. It is in my vba for excel commands,
but only AFTER the first iteration of a loop. It always works fine the first time through. Seems to have something to do with how I am identifying the objects. I've read multiple articles on best practices for working with the objects and the specific error but nothing has translated into a solution. Can someone ELI5 what I am doing wrong?
In the example below it is throwing the error early in the second iteration at the Range("A1").Select command.
Code:
Sub runCleanAndImportUnpre()
Dim strFolder As String
Dim strTableDest As String
strTableDest = "Unpresented_EOD_Import"
strFolder = "C:\Users\lclambe\Projects\Inputs\test2"
Call CleanAndImportUnpresentedInAGivenFolder(strTableDest, strFolder)
End Sub
Function CleanAndImportUnpresentedInAGivenFolder(strTable As String, strFolder As String)
' Function that opens files in a folder, cleans them up and saves them.
Dim myfile
Dim mypath
Dim strPathFileName As String
Dim i As Integer
'Call ClearData(strTable)
'if it needs a backslash on the end, add one
If Right(strFolder, 1) <> "\" Then
strFolder = strFolder & "\"
End If
mypath = strFolder
ChDir (strFolder)
myfile = Dir(mypath)
ChDir (mypath)
myfile = Dir("")
i = 1
Do While myfile <> ""
'Format the excel report
strPathFileName = mypath & myfile
'use for unpresented
Call formatExcelUnPresentedForImport(strPathFileName)
i = i + 1
myfile = Dir()
Loop
End Function
Function formatExcelUnPresentedForImport(filePath As String)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Note:
' Called from CleanAndImportUnpresentedInAGivenFolder when
' importing Unpresented reports
'
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
On Error GoTo formatExcelUnPresentedForImport_Error
Dim strFilePath As String
Dim strReportType As String
Dim i As Integer
Dim iTotal_Row
Dim Lastrow As Long
Dim iCol As Integer
Dim appExcel As excel.Application
Dim wkb As excel.Workbook
Dim sht As Worksheet
Dim rng As Range
strReportType = reportType
strFilePath = filePath
Set appExcel = New excel.Application
appExcel.Visible = False
'Define the worksheet
Set wkb = appExcel.Workbooks.Open(strFilePath, ReadOnly:=False)
'Turn off error msg: "minor loss of fidelity" if you are sure no data will be lost
wkb.CheckCompatibility = False
'Expand Column to avoid scientific notation
appExcel.Columns("A:A").EntireColumn.AutoFit
'Find last row
'FAILS HERE ON SECOND ITERATION OF LOOP:
Range("A1").Select
ActiveCell("A1").Select
Selection.End(xlDown).Select
'Delete the last 3 rows of totals
ActiveCell.offset(-2, 0).Select
Selection.EntireRow.Delete
Selection.EntireRow.Delete
Selection.EntireRow.Delete
'Add a TRIM of Cash Amount Field2 at column L
Range("L2").Select
ActiveCell.FormulaR1C1 = "=TRIM(RC[-9])"
Range("L2").Select
'Copy it to rest of cells to bottom
Selection.Copy
Lastrow = ActiveSheet.Cells(Rows.Count, 1).End(xlUp).Row
Selection.AutoFill Destination:=Range("L2:L" & Lastrow), Type:=xlFillDefault
Range("L2:L" & Lastrow).Select
'Delete original unformatted unpresented
Selection.Copy
ActiveSheet.Paste
Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
:=False, Transpose:=False
'Delete all the rows except Unpresented
Range("B:B,C:C,D:D,E:E,F:F,G:G,H:H,I:I,J:J,K:K").Select
Range("K1").Activate
Selection.Delete Shift:=xlToLeft
'Add a Header
Range("B1").Select
ActiveCell.FormulaR1C1 = "Unpresented"
wkb.Save
wkb.Close
appExcel.Quit
Set wkb = Nothing
Set appExcel = Nothing
On Error GoTo 0
Exit Function
formatExcelUnPresentedForImport_Error:
Set wkb = Nothing
Set appExcel = Nothing
strMessage = "Error " & err.Number & " (" & err.Description & ") in procedure formatExcelUnPresentedForImport of Module modExternalExcelClean."
strMessage = strMessage & " Application will stop processing now." & vbNewLine
strMessage = strMessage & "Please note or copy this error message and contact application developer for assistance."
MsgBox strMessage, vbCritical + vbOKOnly, "Error"
End
End Function

Answer 1

Just guessing that you are not iterating through an Excel file the second time, thus it throws an error. To debug it in ELI5 style, change your code like this:
Do While myfile <> ""
MsgBox myFile
'Format the excel report
strPathFileName = mypath & myfile
'use for unpresented
Call formatExcelUnPresentedForImport(strPathFileName)
i = i + 1
myfile = Dir()
Loop
and pay attention to the MsgBox every time. Is it showing what you think it should be showing?