Powershell / SMO -- scripting out SQL database ddl -- non dbo schema problem

Trying to traverse all objects in the SQL Server database, scripting the object creation to .sql file, to be stored within a source code repository.  

We are using Powershell calling SMO to create the DDL files.   Basically, it works well for all dbo schema objects.  Any other user defined schemas are not being processed correctly.  

The Powershell script is attached.  At line 21 you can see where we tried to handle the schema with this:    $Object=$Schema + "." + $Object

 
EXAMPLES:

This works:      
./schemaextract.ps1 "c:\temp" "ServerName" "DatabaseName" "Table" "dbo" "TableA"

This works, but the object is qualified with ‘dbo’, instead of ‘OtherSchema’.  ‘TableA’ exists within both schemas:
./schemaextract.ps1 "c:\temp" "ServerName" "DatabaseName" "Table" "OtherSchema" "TableA"  

This fails, presumably because ‘TableB’ is only in ‘OtherSchema’:
./schemaextract.ps1 "c:\temp" "ServerName" "DatabaseName" "Table" "OtherSchema" "TableB"
 
We have tried unsuccessfully to pass in the schema name.  When attempting to do so, this is the failure:
 
PS C:\mssql\tools> ./schemaextract.ps1 "c:\temp" "ServerName" "DatabaseName" "Table" "dbo" "TableA"
Directory: C:\temp\DatabaseName
Mode                LastWriteTime     Length Name
----                -------------     ------ ----
d----        12/21/2012   2:46 PM            Tables
Multiple ambiguous overloads found for "Script" and the argument count: "1".
At C:\mssql\tools\SchemaExtract.ps1:97 char:20
+        $scrp.Script <<<< ($db.Tables["$Object"])
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest



We did this several years back with SMO -- no problems at all.  But, we had only the 'dbo' schema at that time.  Is anyone able to advise?
SchemaExtract.txt