Powershell Invoke-Expression A parameter cannot be found that matches parameter name = "" - powershell

Question

Im trying to invoke a Ps script from antoher script. The scripts are both in the same path.
Also the script I'm trying to invoke takes 4 parameters.
Whem i execute that file from powershell with the parameters, then it works without errors.
But invoking it with the Invoke-Expression Command does not work.
Keep getting the error :
'A parameter cannot be found that matches parameter name'
Script with the Paramters :
param ([Parameter(Mandatory = $true)]
[string] $Samname,
[string] $Fullname,
[string] $Password,
[string] $Groups
)
$securePassword = ConvertTo-SecureString $Password -AsPlainText -Force
New-localuser -name $Samname -FullName $Fullname -password $securePassword -PasswordNeverExpires -UserMayNotChangePassword
#Add the User to the Groups
$localGroups = Get-LocalGroup
[string[]]$GroupArray = $Groups.Split(' ')
foreach ($localgroup in $localGroups){
foreach ($group in $GroupArray){
$group = $group.Replace(';', '')
if ($group.toString().Equals($localgroup.toString())){
Add-LocalGroupMember -Group $localgroup -Member $samname
}
}
}
Script with Invoke-Expression command :
$XmlDocument = 'C:\SomeFile\toPs\TmpUser.config'
[XML]$XmlFile = Get-Content $XmlDocument
[string] $Samname = $XmlFile.User.Username
[string] $Fullname = $XmlFile.User.Fullname
[string] $Password = $XmlFile.User.Password
[string] $Groups = $XmlFile.User.Groups
$script = ".\CreateUser.ps1"
Invoke-Expression $script "-Samname $Samname -Fullname $Fullname -Password $Password -Groups $Groups"
I'm not that sure if I'm using the params the right way, when I invoke the script.
Thanks for your help :)

Answer 1

It's hard to tell exactly what's tripping up Invoke-Expression without the full extent of the error message, but the good news is that you don't need Invoke-Expression at all!
Use the invocation operator (also known as the "call operator", &) instead, it natively supports parameter binding:
$XmlDocument = 'C:\SomeFile\toPs\TmpUser.config'
[XML]$XmlFile = Get-Content $XmlDocument
[string] $Samname = $XmlFile.User.Username
[string] $Fullname = $XmlFile.User.Fullname
[string] $Password = $XmlFile.User.Password
[string] $Groups = $XmlFile.User.Groups
$script = ".\CreateUser.ps1"
& $script -Samname $Samname -Fullname $Fullname -Password $Password -Groups $Groups