Importing multiple CSV files to a single XLSX file

I've got a powershell script that does a weekly compare of 2 large files, then divides the results up to create 9 or 10 CSV files.  I want to take those files and import the data into an XLSX file in one step.

$Excel = New-Object -ComObject excel.application
$Excel.visible = $true
$workbooks = $excel.Workbooks.Add()
$worksheets = $workbooks.worksheets
$worksheets.add()
$worksheets.add()
$worksheets.add()
$worksheets.add()
$worksheets.add()
$worksheets.add()
$worksheets.add()
$worksheets.add()
$worksheets.add()


$worksheet1 = $workbooks.sheets.Item(1)
$worksheet1.Name = "All"
$worksheet2 = $workbooks.sheets.Item(2)
$worksheet2.Name = "UAC"
$worksheet3 = $workbooks.sheets.Item(3)
$worksheet3.Name = "AS"
$worksheet4 = $workbooks.sheets.Item(4)
$worksheet4.Name = "BT"
$worksheet5 = $workbooks.sheets.Item(5)
$worksheet5.Name = "CR"
$worksheet6 = $workbooks.sheets.Item(6)
$worksheet6.Name = "CS"
$worksheet7 = $workbooks.sheets.Item(7)
$worksheet7.Name = "CE"
$worksheet8 = $workbooks.sheets.Item(8)
$worksheet8.Name = "CN"
$worksheet9 = $workbooks.sheets.Item(9)
$worksheet9.Name = "PH"
$worksheet10 = $workbooks.sheets.Item(10)
$worksheet10.Name = "Other"

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportfileexcel)
$CellRef = $worksheet1.Range("A1")

#Build, use and remove the text file connector
$Connector = $worksheet1.QueryTables.add($TxtConnector,$CellRef)
$worksheet1.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet1.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet1.QueryTables.item($Connector.name).Refresh()
$worksheet1.QueryTables.item($Connector.name).delete()

$worksheet1.UsedRange.EntireColumn.AutoFit()


#Define the connection string and where the data is supposed to go
$TxtConnector2 = ("TEXT;" + $export00excel)
$CellRef2 = $worksheet2.Range("A1")
#Build, use and remove the text file connector
$Connector2 = $worksheet2.QueryTables.add($TxtConnector2,$CellRef2)
$worksheet2.QueryTables.item($Connector2.name).TextFileCommaDelimiter = $True
$worksheet2.QueryTables.item($Connector2.name).TextFileParseType  = 1
$worksheet2.QueryTables.item($Connector2.name).Refresh()
$worksheet2.QueryTables.item($Connector2.name).delete()
$worksheet2.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportASexcel)
$CellRef = $worksheet3.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet3.QueryTables.add($TxtConnector,$CellRef)
$worksheet3.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet3.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet3.QueryTables.item($Connector.name).Refresh()
$worksheet3.QueryTables.item($Connector.name).delete()
$worksheet3.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportBTexcel)
$CellRef = $worksheet4.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet4.QueryTables.add($TxtConnector,$CellRef)
$worksheet4.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet4.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet4.QueryTables.item($Connector.name).Refresh()
$worksheet4.QueryTables.item($Connector.name).delete()
$worksheet4.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportCRexcel)
$CellRef = $worksheet5.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet5.QueryTables.add($TxtConnector,$CellRef)
$worksheet5.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet5.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet5.QueryTables.item($Connector.name).Refresh()
$worksheet5.QueryTables.item($Connector.name).delete()
$worksheet5.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportCSexcel)
$CellRef = $worksheet6.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet6.QueryTables.add($TxtConnector,$CellRef)
$worksheet6.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet6.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet6.QueryTables.item($Connector.name).Refresh()
$worksheet6.QueryTables.item($Connector.name).delete()
$worksheet6.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportEDexcel)
$CellRef = $worksheet7.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet7.QueryTables.add($TxtConnector,$CellRef)
$worksheet7.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet7.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet7.QueryTables.item($Connector.name).Refresh()
$worksheet7.QueryTables.item($Connector.name).delete()
$worksheet7.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportNUexcel)
$CellRef = $worksheet8.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet8.QueryTables.add($TxtConnector,$CellRef)
$worksheet8.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet8.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet8.QueryTables.item($Connector.name).Refresh()
$worksheet8.QueryTables.item($Connector.name).delete()
$worksheet8.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportPUexcel)
$CellRef = $worksheet9.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet9.QueryTables.add($TxtConnector,$CellRef)
$worksheet9.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet9.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet9.QueryTables.item($Connector.name).Refresh()
$worksheet9.QueryTables.item($Connector.name).delete()
$worksheet9.UsedRange.EntireColumn.AutoFit()

#Define the connection string and where the data is supposed to go
$TxtConnector = ("TEXT;" + $exportOTexcel)
$CellRef = $worksheet10.Range("A1")
#Build, use and remove the text file connector
$Connector = $worksheet10.QueryTables.add($TxtConnector,$CellRef)
$worksheet10.QueryTables.item($Connector.name).TextFileCommaDelimiter = $True
$worksheet10.QueryTables.item($Connector.name).TextFileParseType  = 1
$worksheet10.QueryTables.item($Connector.name).Refresh()
$worksheet10.QueryTables.item($Connector.name).delete()
$worksheet10.UsedRange.EntireColumn.AutoFit()

This script opens Excel and creates/renames all of the tabs, then populates the first worksheet with the correct data.  However, the rest of the worksheets don't import and I get these errors:

"Exception calling "Add" with "2" argument(s):  "The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))"