Server error: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework

An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information. 

Oorzaak

Als bestanden worden gekopieerd van een andere server worden ze geblocked om de server te beschermen. 

Oplossing

Open de file properties en klik op 'Unblock':

Als er meerdere bestanden geblocked zijn kun je onderstaande PowerShell opdracht gebruiken om deze bestanden de unblocken: