Index: deluge/error.py
===================================================================
--- deluge/error.py	(revision 2816)
+++ deluge/error.py	(working copy)
@@ -31,6 +31,8 @@
 #    this exception statement from your version. If you delete this exception
 #    statement from all source files in the program, then also delete it here.
 
+import deluge.xmlrpclib
+
 class DelugeError(Exception):
     def __init__(self, value):
         self.value = value
@@ -40,3 +42,13 @@
 class NoCoreError(DelugeError):
     pass
     
+class InvalidTorrent(DelugeError):
+    pass
+
+def from_xmlrpc_fault(fault):
+    prefix = "deluge.error."
+    string = fault.faultString
+    string = string.replace(':', '(', 1) + ')'
+    if string[:len(prefix)] == prefix:
+        raise eval(string)
+
Index: deluge/ui/client.py
===================================================================
--- deluge/ui/client.py	(revision 2816)
+++ deluge/ui/client.py	(working copy)
@@ -99,6 +99,8 @@
                 except socket.error, e:
                     log.warning("Could not contact daemon: %s", e)
                     self.set_core_uri(None)
+                except deluge.xmlrpclib.Fault, e:
+                    deluge.error.from_xmlrpc_fault(e)
             finally:                        
                 self._callbacks = []