App loading problem

Using Streamlit
7

Hello,I have the same problem!
O the command line:
Last login: Mon Nov 4 13:03:18 on ttys001

(base) MacBookProdeMacBook-Pro:~ macbookpro$ streamlit run st.ipynb

You can now view your Streamlit app in your browser.

Local URL: http://localhost:8501

Network URL: http://192.168.1.100:8501
On the localhost
NameError : name ‘null’ is not defined

File “/Users/macbookpro/anaconda3/lib/python3.6/site-packages/streamlit/ScriptRunner.py”, line 311, in _run_script exec(code, module.dict)

File “/Users/macbookpro/st.ipynb”, line 28, in “execution_count”: null,