My Builk Contacts Import CSV

Guys,

I'm trying to import a .csv file which contains a list of emails using powershell to create external mail contacts. The CSV file has the following headings with an example email address:

Name,Firstname,LastName,ExternalEmailAddress,OrganizationalUnit

simontaylor,Simon,Taylor,simon.taylor@hotmail.com,

When i run the bellow command

[PS] C:\>Import-Csv testcontacts.csv | ForEach { New-MailContact -Name $_.displayName -Firstname $_.FirstName -LastName
$_.LastName -ExternalEmailAddress $_.EmailAddress -OrganizationalUnit "emea.cbre.net/Exchange Contacts/United Kingdom" }

i get the following error

Import-Csv : Cannot process argument because the value of argument "name" is invalid. Change the value of the "name" ar
gument and run the operation again.
At line:1 char:11
+ Import-Csv <<<<  testcontacts.csv | ForEach { New-MailContact -Name $_.displayName -Firstname $_.FirstName -LastName
$_.LastName -ExternalEmailAddress $_.EmailAddress -OrganizationalUnit "emea.cbre.net/Exchange Contacts/United Kingdom"
}
    + CategoryInfo          : InvalidArgument: (:) [Import-Csv], PSArgumentException
    + FullyQualifiedErrorId : Argument,Microsoft.PowerShell.Commands.ImportCsvCommand

Can somebody help please