Powershell Script to Object security

So I am trying to convert a vbscript to a powershell script so that I can use it in a workflow situation. The vbscript creates the object AelitaEDM.EDMOctetString. However when I attempt to create this object in powershell I get the

"Cannot find type [AelitaEDM.EDMOctetString]: make sure the assembly containing this type is loaded."


Any help would be appreciated