diff --git a/GameMap.py b/GameMap.py
index 0cdf3d3..a100ef9 100644
--- a/GameMap.py
+++ b/GameMap.py
@@ -23,7 +23,7 @@ class GameMap:
                 self.data[(x,y)] = player
                 player.add_mark((x,y))
             else:
-                errorMessage = "The mark is already busy by the Player" + self.data[(x, y)].get_name()
+                errorMessage = "The mark is already busy by the Player " + str(self.data[(x, y)].get_name())
                 raise KeyError(errorMessage)
         else:
             errorMessage = "The mark" + str((x,y)) + " is beyond preset max values, max_x - " + str(self.max_size_x) + ", max_y - " + str(self.max_size_y)