Getting error when connecting two Azure Analysis Services from child scripts - powershell

Question

I am working on PowerShell scripts. I have two scripts in those scripts I am connecting with two Azure Analysis Servers one by one. And these scripts are calling by the main script. I am getting errors
"Exception calling "Connect" with "1" argument(s): "Object reference not set to an instance of an object."
My Scripts code is below
Child1.ps1
param(
[String]
$envName1,
[String]
$toBeDisconnect1
)
$loadInfo1 = [Reflection.Assembly]::LoadWithPartialName("Microsoft.AnalysisServices")
$server1 = New-Object Microsoft.AnalysisServices.Server
if($toBeDisconnect1 -eq "No")
{
$server1.Connect($envName1)
return $server1
}
elseif($toBeDisconnect1 -eq "Yes")
{
$server1.Disconnect()
Write-Host $server1 " has been disconnected."
}
Child2.ps1
param(
[String]
$envName1,
[String]
$toBeDisconnect1
)
$loadInfo1 = [Reflection.Assembly]::LoadWithPartialName("Microsoft.AnalysisServices")
$server1 = New-Object Microsoft.AnalysisServices.Server
if($toBeDisconnect1 -eq "No")
{
$server1.Connect($envName1)
return $server1
}
elseif($toBeDisconnect1 -eq "Yes")
{
$server1.Disconnect()
Write-Host $server1 " has been disconnected."
}
MainParent.ps1
param(
$filePath = "C:\Users\user1\Desktop\DBList.txt"
)
$command = "C:\Users\User1\Desktop\test1.ps1 –envName1
asazure://aspaaseastus2.asazure.windows.net/mydevaas -toBeDisconnect1 No"
$Obj1 = Invoke-Expression $command
Start-Sleep -Seconds 15
$command1 = "C:\Users\User1\Desktop\test2.ps1 –envName2
asazure://aspaaseastus2.asazure.windows.net/myuataas -toBeDisconnect2 No"
$Obj2 = Invoke-Expression $command1
Error is below in MainParent.ps1
Exception calling "Connect" with "1" argument(s): "Object reference not set to an instance of an
object."
At C:\Users\User1\Desktop\test1.ps1:13 char:5
+ $server1.Connect($envName1)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : NullReferenceException
Exception calling "Connect" with "1" argument(s): "Object reference not set to an instance of an
object."
At C:\Users\User1\Desktop\test2.ps1:13 char:5
+ $server2.Connect($envName2)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : NullReferenceException
My AzureAnalysis Services dll version is 13.0.4495.10. I am sharing this info, may be it can be a issue.

Answer 1

It seems Invoke-Expression is not passing the param envName1. I would rather call the child script normally like below:
$Obj1 = &"C:\Users\User1\Desktop\test1.ps1" -envName1 "asazure://aspaaseastus2.asazure.windows.net/mydevaas" -toBeDisconnect1 No | select -Last 1
$Obj2 = &"C:\Users\User1\Desktop\test2.ps1" -envName2 "asazure://aspaaseastus2.asazure.windows.net/myuataas" -toBeDisconnect2 No | select -Last 1

Answer 2

$command = "C:\Users\User1\Desktop\test1.ps1 –envName1 asazure://aspaaseastus2.asazure.windows.net/mydevaas -toBeDisconnect1 No"
Look closely at the hyphen before envName1. It's actually – (en-dash) instead of - (hyphen). That's the reason envName1 is not being passed. The second param toBeDisconnect1 has it correct.
How to know the difference? - (hyphen) is shorter than – (en-dash) :)