New-Mailbox : The argument cannot be null or empty

Hi,

I have a csv file like this:
FirstName;LastName;Site;Alias;UPN;DisplayName;Password
Eric;Jens;Paris;E.Jens;Eric.Jens@mahui.com;Eric Jens;Welcome

And I have my Script:

 ## Import data from csv and store it in variable 'data'
 $data = import-csv $args[0]
 
 ## Function to convert password into a secure string
 function New-SecureString([string] $plainText)
 {
    $secureString = new-object System.Security.SecureString
    
    foreach($char in $plainText.ToCharArray())
    {
       $secureString.AppendChar($char)
    }
    $secureString
 }
 
 foreach ($i in $data)
 {
  $ss = new-securestring $i.password
  ## Mailbox Database Path
  $db = "Server_Name\SG01\MDB"
  ## Organization Unit
  $ou = "OU=Users,OU=Administration,DC=Mahui,DC=COM"
  New-Mailbox -Alias $i.Alias -Name $i.DisplayName -OrganizationalUnit $ou -FirstName $i.FirstName -LastName $i.LastName -UserPrincipalName $i.UPN -Database $db -Password $ss -ResetPasswordOnNextLogon $true
  }
 

When I run my script c:\mail.ps1 c:\mail.csv

It returns this error:

New-Mailbox : The argument cannot be null or empty.
At C:\mail.ps1:28 char:20
+  New-Mailbox -Alias  <<<< $i.Alias -Name $i.DisplayName -OrganizationalUnit $
ou -FirstName $i.FirstName -LastName $i.LastName -UserPrincipalName $i.UPN -Dat
abase $db -Password $ss -ResetPasswordOnNextLogon $true

Does anyone have an idea?
Thx

I found the solution...
1/ Instead of ";" I use ","
2/ I change a part of my code
## Import data from csv and store it in variable 'data'
 $data = import-csv c:\mail.csv