Error : Exception calling "MoveTo" with "1" argument(s): "The server is unwilling to process the request. "

Question

I am trying to write a script to move OU of users in AD 2008

$Alias = "hareeshvm"

# Finding the location of the user account harveesm:

$Root = [ADSI]("LDAP://DC=corp,DC=bharatpetroleum,DC=com")
$searcher = new-object System.DirectoryServices.DirectorySearcher($root)

$searcher.filter = "(&(objectClass=user)(mailNickName= $Alias))"

$User = $searcher.findone()

# Binding the user account to $AUser and the OU to move to to $MovetoOU
$ADSPath = $User.Properties.adspath


$MoveToOU = [ADSI]("LDAP://OU=Temp,DC=corp,DC=bharatpetroleum,DC=com")

$AUser = [ADSI]("$ADSPath")

# Command to Do the actual move

$AUser.PSBase.moveto($MoveToOU)

And I am getting below mentioned error

Exception calling "MoveTo" with "1" argument(s): "The server is unwilling to process the request. " At D:\Ashish\MS Exchange\New User\newuserscreation.ps1:39 char:21 + $AUser.PSBase.moveto <<<< ($MoveToOU) + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : DotNetMethodException

thx in advance