Even when I'm setting the database offline, WITH REPLACE & MOVE... I'm getting the same error...

Here's my syntax:

USE [master]

ALTER DATABASE Dev_Database_Test

SET OFFLINE WITH ROLLBACK IMMEDIATE

GO

RESTORE DATABASE Dev_Database_Test

FROM DISK='C:\MSSQL\Backup\DEV-database'+ (select CONVERT(VARCHAR(8), getdate(), 112))+'.bak'

WITH REPLACE,

MOVE 'DEV-Database_Data' TO 'C:\MSSQL\DATA\Dev_Database_Test.mdf',

MOVE 'DEV-Database_1_Data' TO 'C:\MSSQL\DATA\Dev_Database_Test_1.ndf',

MOVE 'DEV-Database_Log' TO 'C:\MSSQL\DATA\Dev_Database_Test.ldf'

ALTER DATABASE Dev_Database_Test SET ONLINE

GO

ALTER DATABASE Dev_Database_Test SET MULTI_USER

GO