diff --git a/eDOCr/tools/box_tree.py b/eDOCr/tools/box_tree.py
index faeed21..03e03eb 100644
--- a/eDOCr/tools/box_tree.py
+++ b/eDOCr/tools/box_tree.py
@@ -29,6 +29,7 @@ def __init__(self, name, x, y ,w, h, crop_img,state, parent=None, children=None)
         self.y = y
         self.w = w
         self.h = h
+        self.size = size   ### adding this line for "AttributeError: can't set attribute 'size'"
         self.crop_img =crop_img
         self.state = state
         self.parent = parent
@@ -183,4 +184,4 @@ def show_tree(rect_list):
     bigdaddy=find_em(rect, 'name', biggest(np.array(rect_list)))[0]
     for pre, _, node in RenderTree(bigdaddy):
         treestr = u"%s%s" % (pre, node.name)
-        print(treestr.ljust(8), node.size)
\ No newline at end of file
+        print(treestr.ljust(8), node.size)