Identity impersonate cause error Could not load file or assembly

Identity impersonate cause error Could not load file or assembly

  
My applicaiton  throws this error

Could not load file or assembly 'COVOSUserMgmtUIReferencesProxy, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

COVOSUserMgmtUI is the name of my application.

The cause is that i have ASP.NET impersonation enabled. When I disable impersonation the error goes away.

How can I get my app to work with impersonation enabled. Do i have to grant network permissions to the users to some outSystems folders on the server? 

Thank you.