Cannot find an overload for /"AddPrinterConnection"/

I am new to Powershell. I am trying to map network printers based on room name. One of the rooms requires 4 printers. The script works on Windows 7 just fine. If I run it on Windows 8.1, the first printer is successfully mapped, but an error occurs for the remaining three. Here is the error:

Cannot find an overload for “AddPrinterConnection” and the argument count: “1″.
At line:24 char:2
+ $net.AddPrinterConnection($PrinterPath)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodException
+ FullyQualifiedErrorId : MethodCountCouldNotFindBest

Cannot find an overload for “AddPrinterConnection” and the argument count: “1″.
At line:29 char:2
+ $net.AddPrinterConnection($PrinterPath)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodException
+ FullyQualifiedErrorId : MethodCountCouldNotFindBest

Cannot find an overload for “AddPrinterConnection” and the argument count: “1″.
At line:34 char:2
+ $net.AddPrinterConnection($PrinterPath)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodException
+ FullyQualifiedErrorId : MethodCountCouldNotFindBest

Here is the script:

$localPrintServer = "\\LIBRPrinter"
$paperCutServer = "\\rhino"
$paperCutServer2 = "\\hippo"
$user = gc env:username
$computer = gc env:computername
$room = $computer.substring(0,7)
$room2 = $computer.substring(0,9)

##Remove all the network printers

Get-WMIObject -class Win32_Printer | where Network -EQ 'True' | foreach{$_.delete()}


if ($room -match "LIBR105")  ##Microforms area staff computers
{
	## Connect first printer
	$PrinterPath = $paperCutServer2 + "\LIBR-LIBR007-01"
	$net = new-Object -com WScript.Network
	$net.AddWindowsPrinterConnection($PrinterPath); 
	
	## Connect second printer
	$PrinterPath = $localPrintServer + "\LIBR007"
	$net1 = new-Object -com WScript.Network
	$net1.AddPrinterConnection($PrinterPath1)
	
	## Connect third printer
	$PrinterPath2 = $localPrintServer + "\MFbwCopier"
	$net2 = new-Object -com WScript.Network
	$net2.AddPrinterConnection($PrinterPath2)
	
	## Connect fourth printer
	$PrinterPath3 = $localPrintServer + "\MFColorCopier"
	$net3 = new-Object -com WScript.Network
	$net3.AddPrinterConnection($PrinterPath3)
	


 }