Why do I get System.IO.FileLoadException: Could not load file or assembly, about once a week on my ASP.Net Website?

Question

I have a rather simple internal ASP.Net Website that has issues loading the Microsoft.Practices.EnterpriseLibrary.Data dll about once a week. Here is the Exception message:

Answer 1

Install the below nuget packages:

Install-Package log4net -Version 2.0.0 Install-Package linqtoexcel

Install-Package System.Data.Sqlite.x86 -Version 1.0.88.0 Install-Package ServiceStack -Version 3.9.71 Install-Package ServiceStack.OrmLite.Sqlite32 -Version 3.9.71

Answer 2

Take a look at the Assembly Binding Log Viewer. It might point you in the right direction.

I had a quick look at other SO answers and one person suggested that the application may have been developed against a signed version of the DLL but the production runtime only has access to an unsigned version. It looks like your production is loading an unsigned assembly (PublicKeyToken=null).