Upgrade to Python 3.8 + duplicate check when adding in sdp

core/concept.py

@@ -99,8 +99,7 @@ class ErrorConcept(Concept):
         Concept.__init__(self, "error", is_builtin=True, where=where, pre=pre, post=post, body=body, desc=desc)
 
     def __repr__(self):
-        return f"{self.name} : {self.body}"
-
+        return f"({self.id}){self.name} : {self.body}"
 
 class Property:
     """