Motivation

During programming suddenly this error (“Failure has occurred while loading a type”) was thrown by accessing a artifact of a referenced library.

In such cases I take the assembly fusion logger fuslogvw to search for problems of loading assemblies. Sometimes an old version from a not expected folder is binded. But all bindings were correct.

Problem

After several hour I got the right hint. Because the assembly is a COM+ one, there are some registration things in die background – and I don’t mean the regsrv-stuff!

And there was one step which access the GUID of the type under “HKEY_CLASSES_ROOT\Wow6432Node\CLSID\{4E83E98D-0D8F-4949-8436-0F001CFE5039}”.

Reason for the problem

Than I remembered, that I started developing of the COM+ library as a normal user – and during runtime I got two errors regarding the accessing of the following keys:

System.EnterpriseServices.RegistrationException : You must have administrative credentials to perform this task. Contact your system administrator for assistance.
----> System.EnterpriseServices.RegistrationException : Failed to register assembly 'ErpUnlinkedObjectsRestSoe, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0123456789abcdef'.
----> System.UnauthorizedAccessException : Access to the registry key 'HKEY_CLASSES_ROOT\ErpUnlinkedObjectsRestSoe' is denied.

I created this key with administrative credentials:

and set the permissions for normal users:

Because after each run the key is deleted I decided to set a deny for delete. So the key stays over the following runs.

The following error

System.EnterpriseServices.RegistrationException : You must have administrative credentials to perform this task. Contact your system administrator for assistance.
----> System.EnterpriseServices.RegistrationException : Failed to register assembly 'ErpUnlinkedObjectsRestSoe, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0123456789abcdef'.
----> System.UnauthorizedAccessException : Access to the registry key 'HKEY_CLASSES_ROOT\CLSID\{4E83E98D-0D8F-4949-8436-0F001CFE5039}' is denied.

I resolved like above.

And these keys were now the basic evil.

Solution

I deleted the key and started my Visual Studio with administrative credentials to run the code.