It sounds like two things may be true:

1. You're running an older version of DNN (likely older than 9.8.0); 
2. You're either missing those files or they're not able to be read for some reason. 

If the files are indeed there, then the most likely issue is Windows folder-level permissions,  Be sure you apply the required permissions so IIS can properly host your website.  

The other possibility could be that you haven't fully setup your environment yet to host an ASP.NET application.  

Hi Will,

Thank you for your response.

We are currently running DNN version 9.10.2 in our production environment without any issues. Now, we’re in the process of setting up a UAT environment using the following steps:

1. Copied the entire website folder from the production server to the UAT server.

2. Backed up the production database and restored it on the UAT SQL Server.

3. Updated the connectionString in webDOTconfig to point to the UAT database.

However, upon launching the site in UAT, I encountered a large number of errors in the logs.

Did I miss anything in the setup process?

also, another attempt I tried for another similar error below:
2025-06-12 14:37:36.504-04:00 [uat][D:2][T:1][ERROR] DotNetNuke.Web.Mvc.Extensions.StartupExtensions - Unable to configure services for Microsoft.SqlServer.Smo, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91, see exception for details 
- LoaderException: Could not load file or assembly 'Microsoft.SqlServer.Dmf.Common, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified.
System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

I tried reinstall the whole sql server service pack, the issue still not fixed. Then I copied all the file from sevice pack folder, then we got another error:
"Could not load file or assembly 'Microsoft.ReportingServices.MapWinControl' or one of its dependencies. An attempt was made to load a program with an incorrect format."

Just to confirm:

• The UAT server is hosting other websites successfully.

• I followed the steps shown in the video you shared.

• The IIS_IUSRS group has full permissions on the entire site folder.

Any guidance would be greatly appreciated.

Best regards,
Jay

You also need to add/update the default PortalAlias in the database.  But, this sounds like a completely different issue/problem than your original post.  Is this the same site? 

Yes, it is the same website.
Those errors are just few examples in our UAT environmnet.
Any more suggestions please?

Also, how should I change portalallias in the database? Is there any instruction I can follow?

Thanks again,

Jay

Did you try forcing the NTSF rights on the folder (and subfolders) from the folders security settings (in windows)?

Thank you Timo.

Yes, I did grant full permission to IIS_IURSRS.and also tried your suggestion, but still no luck.

Any further suggestion please?

Posted By Jie on 6/13/2025 11:43 AM

Yes, it is the same website.
Those errors are just few examples in our UAT environmnet.

Also, how should I change portalallias in the database? Is there any instruction I can follow?

Jay

I don't know... This screams "missing files" or "wrong permissions."