Exception calling "Update" with "0" argument(s): "To add an item to a document library, use SPFileCollection.Add()"

Question

Hi i am trying to add a new item and update existing field value in a document library with powershell 
but i receive below error message.
PS C:\Users\spfarm> C:\Scripts\add.ps1
Exception calling "Update" with "0" argument(s): "To add an item to a document
library, use SPFileCollection.Add()"
At C:\Scripts\add.ps1:24 char:16
+ $newItem.Update <<<< ()
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException
#Add SharePoint PowerShell Snapin which adds SharePoint specific cmdlets
Add-PSSnapin Microsoft.SharePoint.PowerShell -EA SilentlyContinue
#Variables that we are going to use for list editing
$webURL = "http://tspmcwfe:89"
$listName = "test"
#Get the SPWeb object and save it to a variable
$web = Get-SPWeb $webURL
#Get the SPList object to retrieve the "Demo List"
$list = $web.Lists[$listName]
#Create a new item
$newItem = $list.Items.Add()
#Add properties to this list item
$newItem["Title"] = "My second item!"
$newItem["Info"] = "s15"
#Update the object so it gets saved to the list
$newItem.Update()
$web.Dispose()
adil

Answer 1

Hi Adil,
Document Library is different from a normal list. The document library contains files inside it. You need to update the code to add a document to the library. Then you can get hold of the List Item represented by that file and update its properties. Here
is an example:
$WebURL = "http://aissp2013/sites/TestSite"
$DocLibName = "Docs" 
$FilePath = "c:\blogs.txt" 
# Get a variable that points to the folder 
$Web = Get-SPWeb $WebURL 
$List = $Web.GetFolder($DocLibName) 
$Files = $List.Files
# Get just the name of the file from the whole path 
$FileName = $FilePath.Substring($FilePath.LastIndexOf("\")+1)
# Load the file into a variable 
$File= Get-ChildItem $FilePath
# Upload it to SharePoint 
$spFile = $Files.Add($DocLibName +"/" + $FileName,$File.OpenRead(),$false) 
$item = $spFile.Item
$item["Title"] = "New Title"
$item.Update()
$web.Dispose()
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