Powershell SQL Server stored procedure backup

Question

I am trying to backup one particular stored procedure from a SQL Server database by passing parameters from a Python program. Here is the code that I have tried but I keep getting an error.

param([string]$server='dbsed0898', [string]$dbname='global_hub',[string]$sp='dbo.gs_eligibility')

[System.Reflection.Assembly]::LoadWithPartialName(“Microsoft.SqlServer.SMO”) | out-null

$SMOserver = 'Microsoft.SqlServer.Management.Smo' #-argumentlist $server
$srv = New-Object("$SMOserver.Server") $server
$db = $srv.databases[$dbname]

$Objects = $db.storedprocedures[$sp]
$scripter = new-object ("$SMOserver.Scripter") $srv

$Scripter.Script($Objects) | Out-File 
" C:\Users\fthoma15\Documents\backup_03212020.sql"

$db = $SMOserver.databases[$dbname]

$Objects = $db.storedprocedures[$sp]
$Scripter.Script($Objects) | Out-File 

"C:\\Users\\fthoma15\\Documents\\backup_03212020.sql"

Error:

Multiple ambiguous overloads found for "Script" and the argument count: "1".
At line:12 char:5
+ $Scripter.Script($Objects) | Out-File "C:\\Users\\fthoma15\\Document ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodException
+ FullyQualifiedErrorId : MethodCountCouldNotFindBest

Can someone help me?

Answer 1

Here is what i did.

param([string]$server='test', [string]$dbname='test',[string[]]$sp=('test','test'))

[System.Reflection.Assembly]::LoadWithPartialName(“Microsoft.SqlServer.SMO”) | out- 
null

$SMOserver = new-object ("Microsoft.SqlServer.Management.Smo.Scripter") #-argumentlist 
$server
$srv = new-Object Microsoft.SqlServer.Management.Smo.Server("$server")
$db = New-Object Microsoft.SqlServer.Management.Smo.Database
$db = $srv.Databases.Item("$dbname")
$Objects = $db.storedprocedures[$sp[1,3]]
$scripter = new-object ("$SMOserver") $srv

$Scripter.Script($Objects) | Out-File 
"C:\Users\fthoma15\Documents\backup_03212020.sql"

As suggested by AlwaysLearning, i changed the sp variable to an array list,splitting both schema and sp name.