How do I solve this problem

import json
import networkx as nx
import dash
from dash import dcc, html  # Update import statements
from dash.dependencies import Input, Output
import plotly.graph_objs as go

# Load the JSON formatted output
with open("structured_output.json", "r") as json_file:
    structured_output = json.load(json_file)

# Create a directed graph for positive bigrams
positive_tree = nx.DiGraph()
positive_tree.add_node("Positive Bigrams")

# Add subnodes (top 5 positive bigrams)
for entry in structured_output:
    positive_bigram = " ".join(entry["bigram"])  # Replace with the correct key for positive bigrams
    positive_tree.add_edge("Positive Bigrams", positive_bigram)

# Create a directed graph for negative bigrams
negative_tree = nx.DiGraph()
negative_tree.add_node("Negative Bigrams")

# Add subnodes (top 5 negative bigrams)
for entry in structured_output:
    negative_bigram = " ".join(entry["bigram"])  # Replace with the correct key for negative bigrams
    negative_tree.add_edge("Negative Bigrams", negative_bigram)

# Create Dash app
app = dash.Dash(__name__)

# Define app layout
app.layout = html.Div([
    html.H1("Bigrams Visualization"),
    html.Div([
        dcc.Graph(id='positive-tree', config={'displayModeBar': False}),
        dcc.Graph(id='negative-tree', config={'displayModeBar': False})
    ])
])

# Callback to update the graphs
@app.callback(
    [Output('positive-tree', 'figure'), Output('negative-tree', 'figure')],
    [Input('positive-tree', 'relayoutData'), Input('negative-tree', 'relayoutData')]
)
def update_graphs(positive_relayoutData, negative_relayoutData):
    pos_fig = go.Figure()
    pos_pos = nx.spring_layout(positive_tree)
    pos_fig.add_trace(go.Scatter(
        x=[pos_pos[node][0] for node in pos_pos],
        y=[pos_pos[node][1] for node in pos_pos],
        text=[node for node in pos_pos],
        mode='markers+text',
        textposition='bottom center'
    ))
    pos_fig.update_layout(title='Positive Bigrams Tree')

    neg_fig = go.Figure()
    neg_pos = nx.spring_layout(negative_tree)
    neg_fig.add_trace(go.Scatter(
        x=[neg_pos[node][0] for node in neg_pos],
        y=[neg_pos[node][1] for node in neg_pos],
        text=[node for node in neg_pos],
        mode='markers+text',
        textposition='bottom center'
    ))
    neg_fig.update_layout(title='Negative Bigrams Tree')

    return pos_fig, neg_fig

# Run the app
if __name__ == '__main__':
    app.run_server(debug=True)