diff --git a/error.py b/error.py
index 3a8c3e9..23f633c 100644
--- a/error.py
+++ b/error.py
@@ -1,15 +1,21 @@
-class dtMemoryError(Exception):
+class MemoryError(Exception):
     pass
 
 
-class AddressError(dtMemoryError):
+class AddressError(MemoryError):
+    def __init__(self, index=None):
+        super().__init__(self)
+        if not index:
+            self.errorinfo = "None"
+        else:
+            self.errorinfo = str(hex(index))
+
+    def __str__(self):
+        return self.errorinfo
+
+class OutOfMemory(MemoryError):
     pass
 
-
-class OutOfMemory(dtMemoryError):
-    pass
-
-
 class InstructionError(Exception):
     pass
 
@@ -20,3 +26,4 @@ class InvalidInstruction(InstructionError):
 
 class BadOperand(InstructionError):
     pass
+