my DNN version is 7.3.4 - after installation dnn-events module 6.02.01 DNN runs into error
in the log file notes following:

DotNetNuke.Framework.PageBase - An error has occurred while loading page.
System.TypeInitializationException: Der Typeninitialisierer für "System.Web.Helpers.AntiForgery" hat eine Ausnahme verursacht. ---> System.TypeInitializationException: Der Typeninitialisierer für "System.Web.Helpers.Claims.ClaimsIdentityConverter" hat eine Ausnahme verursacht. ---> System.IO.FileLoadException: Die Datei oder Assembly "Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" oder eine Abhängigkeit davon wurde nicht gefunden. Das Handle ist ungültig. (Ausnahme von HRESULT: 0x80070006 (E_HANDLE))
bei System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throw , Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName, ObjectHandleOnStack type)
bei System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throw , Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName)
...

WHAT TODO???

 Microsoft's IdentityModel namespace is a windows identify framework item (https://msdn.microsoft.com/en-us/libr...) - neither it or System.Web.Helpers.AntiForgery are items we ship with DNN - and I am not aware of any module that current uses WIF. I believe the same classes are reused in asp.net identity (http://www.asp.net/identity/overview/...) which was the more modern update of Microsofts sql server membership provider - however this cannot be updated by a simple dll change, it requires a lot of database changes, data migratation and code changes, so we have elected not to move to asp.net identity. Based on your exception something you use is referencing that - or else you have injected the equivalent OWIN middleware. In either case I would not expect things to work - in fact I would expect the entire site to go down with errors about decrypting data (as it would check for and fail to find your credentials)