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Editorial Team
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Asked: 2026-06-09T20:16:02+00:00

I am new to ServiceStack. I am testing out the MovieREST example. When I

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I am new to ServiceStack. I am testing out the MovieREST example. When I run the project, the Immediate Window shows me this error

"A first chance exception of type 'System.DllNotFoundException' occurred in Mono.Data.Sqlite.DLL"

and no movie list is loading up. So, there is only a blank “Add a new movie” page with some default inputs, everytime I hit Add new movie, the DllNotFoundException will be thrown.

Do I need to install any dependency projects to make it work? I am running it with VS2010, IIS, and Vista 32bit (yup..I know..). Also installed Mono and sqlite 32bit just now blindly, I am not even sure if the project needs them to run. From the code, I can see it is referring to “App_Data/db.sqlite” and References already has sqlite3.dll, I replaced the dll with the 32bit one I download anyway, but still no luck.

Please give me some hints on what I am missing? Thank you.

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1 Answer

  1. Editorial Team

    The Mono.Data.Sqlite.DLL is just a managed wrapper that needs to find the unmanaged sqlite3.dll in order to run (which is what holds the native binary of Sqlite itself).

    It looks for this in the /bin directory, to have it deployed there whenever you build you need to copy sqlite3.dll to your project root / and set the Build Action to Content and change the Copy action to Copy if newer.

    Ideally you’d want to use the right sqlite3.dll for your architecture (the ServiceStack.OrmLite.Sqlite.Mono NuGet package contains both 32bit / 64bit dlls) although IIS/.NET can work with 32bit unmanaged dlls but will require some tweaking explained here.

    Using mixed-mode assemblies

    Whilst Mono.Data.Sqlite.DLL lets you run the same .NET app on Mono, if you only want to run Sqlite in Windows you can also use the mixed-mode assemblies that have the unmanaged native sqlite library embedded in the .NET dll. There are 2 different versions available on NuGet:

    Remove any references to existing OrmLite or Sqlite dlls as both of these NuGet packages contain all the Sqlite + OrmLite dlls needed.

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