Iterating/Executing TSQL-Scripts in Subfolders throws an error

Hi Forum,

the idea: I have several subfolders containing tsql-scripts. I want to change into a folder and execute every script - sorted by name (important because of dependencies).
I have an array with Subfolder names, I build on fly an array wiht script names inside of every subfolder, I'm reading the content of a tsql-file (sentence by sentence), I'm paying attention for a "go" statement and then execute the command.
When the first script doesn't end with a "go" statement, I'll get an error executing the first line of the second script.
I don't know where to set my command-variable to $null or to blank (" ").
For example the first script is:

DECLARE @CMD varchar(500)
SET @CMD = 'EXEC sp_configure ''show advanced option'', ''1'';
  	    reconfigure with override
       	    EXEC sp_configure ''xp_cmdshell'',''1''
            reconfigure with override'
print @CMD
EXEC (@CMD)

sp_configure 'allow updates','1'
go
reconfigure with override
GO

DECLARE @CMD varchar(500)
SET @CMD = 'EXEC sp_configure ''show advanced option'', ''1'';
       reconfigure with override
            EXEC sp_configure ''xp_cmdshell'',''1''
            reconfigure with override'
print @CMD
EXEC (@CMD)

sp_configure 'allow updates','1'

Exception calling "ExecuteScalar" with "0" argument(s): "Incorrect syntax near 'allow updates'."
At L:\SQL-INSTALL\Install_AdminDB.ps1:42 char:50
+                         $SQLCommand.ExecuteScalar <<<< ()
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

My PSScript looks like that:

param(
        #$ServerName
        [parameter(Mandatory=$true,
               HelpMessage="SQLServer-Name?",Position=0)]
        [String]
        [ValidateNotNullOrEmpty()]
        $ServerName = $(throw "sqlserver parameter is required.")             
     )
$Paths = "DEV_1", "DEV_2", "DEV_3"
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.Smo") | Out-Null
$objSQLConnection = New-Object System.Data.SqlClient.SqlConnection
$objSQLConnection.ConnectionString = "Server=$ServerName;Integrated Security=SSPI;"
$objSQLConnection.Open() #| Out-Null
foreach($path in $Paths)
{
    $sqlSkripts = Join-Path ($PWD.Path) $path | dir -Filter "*.sql" | sort-object name"sqlSkripts: " + $sqlSkripts
    foreach($sqlSkript in $sqlSkripts)
    {
        $SQLCommandText = @(Get-Content -Path $sqlSkript.FullName)  "#" * $sqlSkript.FullName.Length  | Out-File -FilePath ($PWD.Path + "\SQLProtokoll.txt") -Append
        $sqlSkript.FullName | Out-File -FilePath ($PWD.Path + "\SQLProtokoll.txt") -Append"#" * $sqlSkript.FullName.Length  | Out-File -FilePath ($PWD.Path + "\SQLProtokoll.txt") -Append
        Try
        {            
            foreach($SQLString in  $SQLCommandText)
            {
                if($SQLString -ne "go") 
                {
                    $SQLPacket += $SQLString + "`n"
                }
                else
                {
                    $IsSQLErr = $false
                    try
                    {
                        $SQLCommand = New-Object System.Data.SqlClient.SqlCommand($SQLPacket, $objSQLConnection)
                        $SQLCommand.ExecuteScalar()
                    }
                    catch
                    {
                        Write-Host "Error..."
                        $IsSQLErr = $true"SQLPaket: " + $SQLPacket
                        $SQLPacket | Out-File -FilePath ($PWD.Path + "\SQLProtokoll.txt") -Append
                        $Error[0] | Out-File -FilePath ($PWD.Path + "\SQLProtokoll.txt") -Append
                    }
                    $SQLPacket = $null
                    $SQLString = ""
                }
            }
        }
        Catch
        {
            $errText =  $Error[0].ToString()"Error: " + $errText | Out-File -FilePath ($PWD.Path + "\SQLProtokoll.txt") -Append
            continue
        }
        $SQLCommandText = ""
    }
}   
$objSQLConnection.Close()
Write-Host "Done!..." -NoNewline