Created Issue: Unable to install package

While installing CslaDBAGuidance package, at the end of installation, get folloing error, and installation rolledback. I have VS2008 installed and I also installed Ent. Lib. 4.0.
Event Viewer Log:
Event Type: Error
Event Source: MsiInstaller
Event Category: None
Event ID: 11001
Date: 6/29/2008
Time: 12:43:45 AM
User: TOR-TEST-21\Administrator
Computer: TOR-TEST-21
Description:
The description for Event ID ( 11001 ) in Source ( MsiInstaller ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: Product: CslaDBAGuidancePackage -- Error 1001. Error 1001. Unable to get installer types in the C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PublicAssemblies\CslaDBAGuidancePackageInstaller.dll assembly. --> Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information., (NULL), (NULL), (NULL).
Data:
0000: 7b 42 36 37 45 37 45 32 {B67E7E2
0008: 41 2d 43 37 35 38 2d 34 A-C758-4
0010: 39 41 42 2d 38 30 30 37 9AB-8007
0018: 2d 30 41 35 45 39 45 41 -0A5E9EA
0020: 41 45 45 32 37 7d AEE27}