Microsoft Crm 4.0 WebServices Error

Problem:
In MS CRM 4.0, I encountered the problem of placing my site in the virtual directory of the MS CRM site.

The error was as follows:
Microsoft.Crm.WebServices.Crm2007.MultipleOrganizationSoapHeaderAuthenticationProvider, Microsoft.Crm.WebServices, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35 'doesn't exist.
Parameter name: Microsoft.Crm.WebServices.Crm2007.MultipleOrganizationSoapHeaderAuthenticationProvider, Microsoft.Crm.WebServices, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35

Solution:
Found on the Dynamics forum
The solution is completely delusional (it is not clear why we should do this), but the only way we managed to launch our site. It is necessary to register the Microsoft.Crm.WebServices.dll library on the MS CRM server in the GAC'e (lies in the% path of the CRM web installation% / bin)

gacutil / i Microsoft.Crm.WebServices.dll

PS If you did not find gacutil.exe, then in Explorer you can simply drag the desired DLL into the WINDOWS \ assembly folder.