RPC server unavailable

Also receiving error “The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)” when executing the Excel Application Scope activity.

Error only appeared today after creating a new Excel Application Scope in my exiting workflow. Other Excel Application Scope activities in the workflow work fine.

UiPath is installed on a Windows 2012 R2 Amazon AWS EC2 instance.

Unsure why the new Excel Application Scope activity produces this error while the other same activities in the workflow do not.