EPiServer - ReflectionTypeLoadException: Unable to load one or more of the requested types

Downloading stuff off of the Internet is dangerous. Luckily the folks in Redmond are there to protect us.
/ Joel Abrahamsson

I just got this error and solved it thanks to this posting. Thanks Marthin for sharing. The people in Redmond are dangerous! :-)

I was searching for something completely different, but stumbled upon this blog which actually resolves a very annoying error I've been struggling finding an answer to. Thanks!

Got the same initial problem and after unblocking the downloaded dlls I now still got the same error message but now it complains at my dll for the templates especially the two types Global and MasterPage...!?

I'm clueless about this right now since that dll isn't downloaded!

This post really helped my today :) Awsome!!

I unblocked the files, but had to reboot too before the site would run.

hi martin,

For me i didn't faced the problem of unblocking but still m getting the following error when using PageTypeBuilder 2.0.

The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.

1) The export 'PageTypeBuilder.Initializer (ContractName="EPiServer.Framework.IInitializableModule")' is not assignable to type 'EPiServer.Framework.IInitializableModule'.

Resulting in: Cannot set import 'EPiServer.Framework.Initialization.InitializationEngine.Modules (ContractName="EPiServer.Framework.IInitializableModule")' on part 'EPiServer.Framework.Initialization.InitializationEngine'.
Element: EPiServer.Framework.Initialization.InitializationEngine.Modules (ContractName="EPiServer.Framework.IInitializableModule") --> EPiServer.Framework.Initialization.InitializationEngine

Can u assist me in this or any help appreciated.

Thanks,
MD

MD - Did you solve your problem? We are having a similar problem right now.

Helped me, thanks!

I too facing the similar problem.... i unblocked in the general tab of each and every dll but still iam facing the problem.... please help me out....below is my problem

Server Error in '/' Application.
Unable to load one or more of the requested types. The following information may be a subset of the Type/LoaderException information present - inspect with debugger for complete view.
Check assemblies [EPiServer.ContentChannelService, Version=5.1.422.122, Culture=neutral, PublicKeyToken=8fe83dea738b45b7] and/or types [EPiServer.BaseLibrary.IContentChannelHandler,
EPiServer.ContentChannels.ContentChannelHandlerBase,
EPiServer.ContentChannels.ContentChannelHandler,
EPiServer.ContentChannels.Events.ChannelEventArgs,
EPiServer.ContentChannels.Events.ChannelPreActionEvent,
EPiServer.ContentChannels.Events.FileMetaDataImportingEventArgs,
EPiServer.ContentChannels.Events.PageDeletingEventArgs,
EPiServer.ContentChannels.Events.PageDeletedEventArgs,
EPiServer.ContentChannels.Events.FileEventArgs,
EPiServer.ContentChannels.Events.FileDeletingEventArgs,
EPiServer.ContentChannels.Events.PageFileImportingEventArgs,
EPiServer.ContentChannels.Events.PageImportedEventArgs,
EPiServer.ContentChannels.Events.FileImportingEventArgs,
EPiServer.ContentChannels.Events.PageImportingEventArgs,
EPiServer.ContentChannels.ListWrapper,
EPiServer.ContentChannels.ContentChannel+PropertyMap,
EPiServer.ContentChannels.ContentChannelAdministration,
EPiServer.ContentChannels.ObjectStoreContentChannelAdministration,
EPiServer.WebServices.ContentChannelService,
{A1675BE9-2FF7-4E6A-A90A-91AABEB448E8}]. Information from LoaderExceptions property [Could not load file or assembly 'EPiServer.BaseLibrary, Version=5.1.422.122, Culture=neutral, PublicKeyToken=8fe83dea738b45b7' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040),
Could not load file or assembly 'EPiServer.UI, Version=5.1.422.122, Culture=neutral, PublicKeyToken=8fe83dea738b45b7' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040),
Could not load file or assembly 'EPiServer.UI, Version=5.1.422.122, Culture=neutral, PublicKeyToken=8fe83dea738b45b7' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)].