error with my powershell scripts

Hi,
Someone in EE has sharing me on this scripts use to extract accounts services. but it return me below error.



PS F:\PowerShell_Myscripts> .\checkservices.ps1
Missing expression after unary operator '-'.
At F:\PowerShell_Myscripts\checkservices.ps1:5 char:10
+         - <<<< namespace root\Microsoft\SqlServer\ComputerManagement
PS F:\PowerShell_Myscripts>

$Instances = get-content "F:\PowerShell_Myscripts\AllServers.txt"
 
$Instances|%{
$sqlservice = Get-WmiObject     
        -namespace root\Microsoft\SqlServer\ComputerManagement
        -class SqlService
        -filter "ServiceName='MSSQL`$_'"
$sqlService
} >> F:\PowerShell_Myscripts\result.txt

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