Log shipping restoration Problem

Dear Sir,
I’m from Brazil and very inexperienced in SQL Server. I need some advice. Please help me.
I’ve been trying to implement a log shipping procedure using the guide wrote by Mr. Brad M. McGehee (http://www.databasejournal.com/features/mssql/article.php/1467581/How-to-Do-SQL-Server-Log-Shipping.htm) and I’m having trouble to make it work. The restoration process fails. Not sure why. Maybe I did something wrong when creating the stored procedures but I just can’t find the error.
After reviewing the SQL Job log, I found this error message:
Could not obtain a required interface from OLE DB provider 'ADsDSOobject'.[SQLSTATE 42000][error 7301]. The Step Failed.

In my case, I use the following variables:
Database name: ALTERDATA
Databse files: ALTERDATA_MODELO.mdf and ALTERDATA_log.ldf
Backup Devices: ERP_DB_BK_DEVICE.BAK and ERP_LOG_BK_DEVICE.BAK
STANDBY SERVER NAME: PET300
________________________________________________________________________
CREATE PROCEDURE restore_database_backups AS

RESTORE DATABASE ALTERDATA
FROM DISK = 'D:LSERP_DB_BK_DEVICE.BAK'
WITH
DBO_ONLY,
REPLACE,
STANDBY = 'D:SQL_DADOSMSSQLDATAUNDO_ALTERDATA_LOG.ldf',
MOVE 'ALTERDATA_MODELO' TO 'D:SQL_DADOSMSSQLDATAALTERDATA_MODELO.mdf',
MOVE 'ALTERDATA_LOG' TO ' D:SQL_DADOSMSSQLDATAALTERDATA_log.ldf’

WAITFOR DELAY '00:00:05'

EXEC sp_dboption 'ALTERDATA, 'single user', true
________________________________________________________________________
CREATE PROCEDURE restore_log_backups AS

RESTORE LOG ALTERDATA
FROM DISK = 'D:LSERP_DB_BK_DEVICE.BAK'
WITH
DBO_ONLY,
STANDBY = 'D:SQL_DADOSMSSQLDATAUNDO_ALTERDATA_LOG.ldf',

WAITFOR DELAY '00:00:05'

EXEC sp_dboption 'ALTERDATA, 'single user', true
_____________________________________________________________________
The job steps failing look like this:
EXEC PET300.master.dbo.restore_log_backups
And
EXEC PET300.master.dbo.restore_database_backups
What am I doing wrong? Please, help.
Yours,
Eduardo Teixeira

I believe it is linked server issue...
Make sure your linked server configuration is correct and you can access the data and execute the procedure via linked server...

I think you´re correct but I still don't know how to solve the problem. When I try to access the standby (linked) server tables, I get the following error:
Error 7301: Could not obtain a required interface from the OLE DB provider 'ADsDSOObject'. OLE DB error trace [OLE/DB Provider 'ADsDSOObject' Unknown:: QueryInterface returned ... IDBSchemaRowset].
in different words, it's the same error I found in the job history report. Can someone please help?
Yours,
Eduardo