python data visualization error

Why does my_layout report an error at the end?

import requests
from plotly.graph_objs import Bar
from plotly import offline

url = 'https://api.github.com/search/repositories?q=language:python&sort=stars'
headers = {'Accept': 'application/vnd.github.v3+json'}
r = requests.get(url, headers=headers)
print(f'Status code: {r.status_code}')

# 处理结果
dict = r.json()
repo_dicts = response_dict['items']
repo_names, stars = [], []
for repo_dict in repo_dicts:
    repo_names.append(repo_dict['name'])
    stars.append(repo_dict['stargazers_count'])

# 可视化
data = [{
    'type': 'bar',
    'x': repo_names,
    'y': stars,
    'marker': {
        'color': 'rgb(60, 100, 150)',
        'line': {'width': 1.5, 'color': 'rab(25, 25, 25)'},
    },
    'opacity': 0.6,
}]
my_layout = {
    'title': "Github上最受欢迎的Python项目",
    'titlefont': {'size': 28},
    'xaxis': {
        'title': 'Repositories'
        'titlefont':  {'size': 24},
        'tickfont' : {'size': 14},
    },
    'yaxis': {
        'title': 'Stars',
        'tickfont': {'size': 24},
        'tickfont': {'size': 14},
    },
}

fig = {'data': data, 'layout': my_layout}
offline.plot(fig, filename='repo.html')