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There could be various reasons why you are unable to access Jupyter Notebook. Here are a few things you could try:

1. Check if Jupyter Notebook is installed on your computer: You must have Jupyter Notebook installed on your computer to use it. If it is not installed, you can download and install it from the official website.

2. Check if you are using the correct URL: The URL to access Jupyter Notebook should be http://localhost:8888/tree. Make sure that you are using the correct URL to access it.

3. Check if the Jupyter Notebook server is running: Jupyter Notebook runs on a web server. Make sure that the server is running by checking if the Jupyter Notebook icon is active on your computer taskbar or dock.

4. Check if there is any firewall or antivirus software blocking your access to Jupyter Notebook. You might need to modify your firewall or antivirus settings to allow access to Jupyter Notebook.

These are a few possible reasons why you are unable to access Jupyter Notebook. If none of these solutions work for you, you might need to seek further assistance or look for other alternatives.