Unable to load one or more of the requested types error

In your global.asax add a reference

using System.Reflection;

and handle ReflectionTypeLoadException

loop through the LoaderExceptions collection to find all missing references.

code for example

string appNamespace = null;

            try

            {

                // determine namespace of main assembly

                foreach (Assembly ass in AppDomain.CurrentDomain.GetAssemblies())

                {

                    foreach (Type type in ass.GetTypes())

                    {

                        if (type.IsSubclassOf(typeof(HttpApplication)))

                        {

                            appNamespace = type.Namespace;

                            break;

                        }

                    }

                    if (appNamespace != null)

                        break;

                }

            }

            catch(Exception ex)

            {

                StringBuilder sb = new StringBuilder();

                if (ex is ReflectionTypeLoadException)

                {

                    foreach (Exception exSub in ((ReflectionTypeLoadException)ex).LoaderExceptions)

                    {

                        sb.AppendLine(exSub.Message);

                        if (exSub is FileNotFoundException)

                        {

                            FileNotFoundException exFileNotFound = exSub as FileNotFoundException;

                            if (!string.IsNullOrEmpty(exFileNotFound.FusionLog))

                            {

                                sb.AppendLine(exFileNotFound.FusionLog);

                            }

                        }

                    }

                    try

                    {

                        using (StreamWriter outfile = new StreamWriter(Config.GetValue("Logger.ReferenceErrorLog", "referenceerror.log"), true))

                        {

                            outfile.Write(sb.ToString());

                        }

                    }

                    catch{}

                }

                else

                {

                   try

                   {

                    using (StreamWriter outfile = new StreamWriter(Config.GetValue("Logger.ReferenceErrorLog","referenceerror.log"),true))

                    {

                        outfile.Write(ex.Message);

                    }

                   }

                   catch { }

                    throw;

                }

            }