Update app.py

app.py

@@ -32,7 +32,7 @@ def draw_graph(G, pos=None, title="Graph Visualization"):
 # Default example code
 def default_example_circular_tree():
     G = nx.balanced_tree(3, 5)
-    pos = nx.nx_agraph.graphviz_layout(G, prog="twopi", args="")
+    pos = nx.nx_agraph.pygraphviz_layout(G, prog="twopi", args="")
     plt.figure(figsize=(8, 8))
     nx.draw(G, pos, node_size=20, alpha=0.5, node_color="blue", with_labels=False)
     plt.axis("equal")
@@ -50,7 +50,7 @@ def create_own_graph_circular_tree():
     if generate_button:
         # Generate graph and layout
         G = nx.balanced_tree(branching_factor, depth)
-        pos = nx.nx_agraph.graphviz_layout(G, prog="twopi", args="")
+        pos = nx.nx_agraph.pygraphviz_layout(G, prog="twopi", args="")
         
         # Draw the graph
         plt.figure(figsize=(8, 8))