Split XML by node - powershell

Question

I've got a big XML file (more than 4Gb) and i should integrate it into SQL table.
SQL has a 2 Gb limitation. The idea is to split the file into serveral XML. For example 500Mb by file.
I try to adapt a powershell script but i still have the following error
Here is the PowerShell script i'm using and i can't find what's wrong
param( [string]$file = $(throw "ENTITY.XML"), $matchesPerSplit = 50, $maxFiles = [Int32]::MaxValue, $splitOnNode = $(throw "entity"), $offset = 0 )
$ErrorActionPreference = "Stop";
trap {
$ErrorActionPreference = "Continue"
write-error "Script failed: $_ \r\n $($_.ScriptStackTrace)"
exit (1);
}
$file = (resolve-path $file).path
$fileNameExt = [IO.Path]::GetExtension($file)
$fileNameWithoutExt = [IO.Path]::GetFileNameWithoutExtension($file)
$fileNameDirectory = [IO.Path]::GetDirectoryName($file)
$reader = [System.Xml.XmlReader]::Create($file)
$matchesCount = $idx = 0
try {
"Splitting $from on node name='$splitOnNode', with a max of $matchesPerSplit matches per file. Max of $maxFiles files will be generated."
$result = $reader.ReadToFollowing($splitOnNode)
$hasNextSibling = $true
while (-not($reader.EOF) -and $result -and $hasNextSibling -and ($idx -lt $maxFiles + $offset)) {
if ($matchesCount -lt $matchesPerSplit) {
if($offset -gt $idx) {
$idx++
continue
}
$to = [IO.Path]::Combine($fileNameDirectory, "$fileNameWithoutExt.$($idx -$offset)$fileNameExt")
"Writing to $to"
$toXml = New-Object System.Xml.XmlTextWriter($to, $null)
$toXml.Formatting = 'Indented'
$toXml.Indentation = 2
try {
$toXml.WriteStartElement("split")
$toXml.WriteAttributeString("cnt", $null, "$idx")
do {
$toXml.WriteRaw($reader.ReadOuterXml())
$matchesCount++;
$hasNextSibling = $reader.ReadToNextSibling($splitOnNode)
} while($hasNextSibling -and ($matchesCount -lt $matchesPerSplit))
$toXml.WriteEndElement();
}
finally {
$toXml.Flush()
$toXml.Close()
}
$idx++
$matchesCount = 0;
}
}
}
finally {
$reader.Close()
}
My XML file is on the same folder as the PS file and "entity" is the node.