New-ADuser error: The server is unwilling to process the request

Hi

I am attempting to add new users in bulk to AD using the below PowerShell script:

Import-Module ActiveDirectory
Import-Csv "C:\users1.csv" | New-ADuser -PasswordNeverExpires $true -AccountPassword (ConvertTo-SecureString "Pass1234" -AsPlainText -Force) -Enabled $True -Server <AD-servername>

Note: <AD-servername> is replaced by the actual name of the Domain Controller

The contents of the CSV are (lines 1 & 2 only are provided below):

Name,Type,SamAccountName,GivenName,Surname,DisplayName,Description,EmailAddress,Company,StreetAddress,State,PostalCode,City,Country,Organization,Path,UserPrincipalName
DOE John,User,DJohn,John,DOE,John DOE,Sales Supervisor ,DJohn@domain.com,Corp Europe,16 Street Add,MA,1234,Boston,USA,Corp,"OU=Users,OU=warehouse01 - boston - ma,OU=Massachussetts,DC=domain,DC=net",DJohn@domain.com

When executing the script I get the following error:

New-ADuser : The server is unwilling to process the request
At C:\Users.ps1:2 char:29
+ Import-Csv "C:\users ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (CN=Djohn...et,DC=domain,DC=net:String) [New-ADUser], ADException
    + FullyQualifiedErrorId : The server is unwilling to process the request,Microsoft.ActiveDirectory.Management.Commands.NewADUser

After investigation on different forums (e.g: http://www.manageengine.com/products/ad-manager/help/misc/troubleshooting_tips.html#admgmt_usermodificatio_80072035 or http://social.technet.microsoft.com/Forums/scriptcenter/en-US/ae10b881-ae5b-4382-b033-47174e5acd8a/error-with-newaduser-command?forum=winserverpowershell) I have verified:

1. that the OU Path is spelled correctly
2. that no other user with the same samaccountname exists in AD
3. that the pipe from import-csv to new-aduser works correctly
4. that the import-csv command imports correctly (see result below): 

Name              : DOE John
Type              : User
SamAccountName    : DJohn
GivenName         : John
Surname           : DOE
DisplayName       : John DOE
Description       : Sales Supervisor
EmailAddress      : DJohn@domain.com
Company           : Corp Europe
StreetAddress     : 16 Street Add
State             : MA
PostalCode        : 1234
City              : Boston
Country           : USA
Organization      : Corp
Path              : OU=Users,OU=warehouse01 - boston - ma,OU=Massachussetts,DC=domain,DC=net
UserPrincipalName : Djohn@domain.com

PS: the OU Users is the child OU of warehouse01 - boston - ma which is itself a child of Massachussetts

PPS: Domain.com is the external dns domain name.  Domain.net is the local dns domain name. All our users have this format. 

==

What is this error? what am i doing wrong?

Thanks,

Karim