SS&C Blue Prism Community

What are the list of Encryption Scheme available in Blueprism (v4.2.50.0) so as to use the Encryption object ?

I am getting the below mentioned exception in one of the business object. Any help would be highly appreciated: Internal : Could not execute code stage because exception thrown by code stage: Could not load file or assembly 'System, Version=4.0.0.0,...