I am running SQL Server 2005 and trying to make a copy of a database from
Management Studio.  Using the Backup wizard I go through all the steps that
you would normally walk through to make a copy, and actually start the copy,
but when I do I get the following error message from the copy database wizard.

"Could not load type
'Microsoft.SqlServer.Management.Smo.Agent.JobBaseCollection' from assembly
'Microsoft.SqlServer.Smo, Version=9.0.242.0, Culture = neutral, Public Token
= xxxx..."

Could somone tell me what the problem is and how to correct it?

My SS version numbers etc follow:

Microsoft SQL Server Management Studio                        9.00.1399.00
Microsoft Analysis Services Client Tools                        2005.090.1399.00
Microsoft Data Access Components (MDAC)                        2000.085.1117.00
(xpsp_sp2_rtm.040803-2158)
Microsoft MSXML                        2.6 3.0 4.0 5.0 6.0
Microsoft Internet Explorer                        7.0.5730.11
Microsoft .NET Framework                        2.0.50727.832
Operating System                        5.1.2600