Rhinoceros 7 technical error support

Hello, My name is Harley

I’m currently using Rhino 7 Student as my main design tool for almost a year and its been well.

But last week when i open Rhino 7 and it’s started to giving me an error message and asked me to sign in my account repeatedly. not working at all.

An unexpected error occurred. Could not load file or assembly 'System.Security, Version =[], The system cannot find the file specified.

please help!!

I just replied to your message to Tech support.