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

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

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.] System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) +0 System.Reflection.RuntimeModule.GetTypes() +9 System.Reflection.Assembly.GetTypes() +143 Sitecore.Install.Configuration.InstallerObjectFactory..ctor() +113 ...

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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408

Solution:

Mostly a missing dll in the bin folder of you website root is the problem!

Only dlls are used which have a reference in your Visual Studio solution.

All the other Sitecore.* .dll are not included. Check if those are available!