Message of error 'One or more of the required types could not be loaded. For additional details, look up the LoaderExceptions field.'

c# entity-framework


Using Enterprise Framework, SQL Server 2000, Visual Studio 2008, and Enterprise Library, I created an application.

Locally, everything runs without a hitch, however when I try to deploy the project to our test environment, I receive the following error:

Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information

Stack trace: at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark)

at System.Reflection.Assembly.GetTypes()

at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.LoadTypesFromAssembly(LoadingContext context)

at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.InternalLoadAssemblyFromCache(LoadingContext context)

at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.LoadAssemblyFromCache(Assembly assembly, Boolean loadReferencedAssemblies, Dictionary2 knownAssemblies, Dictionary2& typesInLoading, List`1& errors)

at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies)

at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyForType(Type type)

at System.Data.Metadata.Edm.MetadataWorkspace.LoadAssemblyForType(Type type, Assembly callingAssembly)

at System.Data.Objects.ObjectContext.CreateQuery[T](String queryString, ObjectParameter[] parameters)

Any ideas on how to address the Entity Framework problem that seems to exist?

6/10/2013 12:59:02 PM

Accepted Answer

By changing the Copy Local property of the references in my project to true, I was able to resolve this problem.

9/29/2015 4:46:23 PM

Popular Answer

There isn't a real magic solution to this problem. Having all the knowledge necessary to comprehend the issue is crucial. Most likely, a referenced assembly is absent from a dynamically loaded assembly. This assembly must be located in your application's bin directory.

Find the missing piece using this code.

using System.IO;
using System.Reflection;
using System.Text;

    //The code that causes the error goes here.
catch (ReflectionTypeLoadException ex)
    StringBuilder sb = new StringBuilder();
    foreach (Exception exSub in ex.LoaderExceptions)
        FileNotFoundException exFileNotFound = exSub as FileNotFoundException;
        if (exFileNotFound != null)
                sb.AppendLine("Fusion Log:");
    string errorMessage = sb.ToString();
    //Display or log the error based on your application.

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