diff --git a/AI.py b/AI.py
index c6d084c..396cd9c 100644
--- a/AI.py
+++ b/AI.py
@@ -63,7 +63,7 @@ def turn(self, world):
                      my_paths = myself.paths_from_player
                      path = my_paths[random.randint(0, len(my_paths) - 1)]
                      size = len(path.cells)
-                     cell = path.cells[(size + 1) / 2]
+                     cell = path.cells[int((size + 1) / 2)]
                      world.cast_unit_spell(unit=unit, path=path, cell=cell, spell=received_spell)
 
         # this code tries to upgrade damage of first unit. in case there's no damage token, it tries to upgrade range
diff --git a/controller.py b/controller.py
index 378523f..a5f1d28 100644
--- a/controller.py
+++ b/controller.py
@@ -1,6 +1,7 @@
 import os
 import sys
 import threading
+import traceback
 from queue import Queue
 from threading import Thread
 
@@ -49,7 +50,8 @@ def launch_on_thread(self, action, world):
             action(world)
         except Exception as e:
             print("Error in client:")
-            print(e)
+            traceback.print_exc()
+            #print(e)
         world.queue.put(Message(type=ServerConstants.MESSAGE_TYPE_END_TURN, turn=world.current_turn, info={}))
 
     def start(self):
diff --git a/world.py b/world.py
index c079e15..fb65653 100644
--- a/world.py
+++ b/world.py
@@ -413,10 +413,10 @@ def cast_unit_spell(self, unit=None, unit_id=None, path=None, path_id=None, cell
         if unit is not None:
             unit_id = unit.unit_id
         if path is not None:
-            path_id = path.path_id
+            path_id = path.id
         message = Message(type="castSpell", turn=self.get_current_turn(),
                           info={
-                              "typeId": spell.type,
+                              "typeId": spell.type_id,
                               "cell": {
                                   "row": cell.row,
                                   "col": cell.col