How to Fix Jupyter Notebook Application Launch Error in Anaconda 3

Understanding the Jupyter Notebook Launch Error

• 💡 The "Application launch error" in Jupyter Notebook within Anaconda 3 is typically caused by a permissions issue.

Accessing and Modifying Folder Permissions

• 🔑 To resolve this, first open the Run window (Windows key + R) and type %appdata% to access the roaming folder.
• 🎯 Navigate to the jupyter\runtime folder within the roaming directory.
• ⚙️ Right-click on the runtime folder, select Properties, go to the Security tab, and attempt to add or modify permissions to grant full access.

Using Command Prompt for Permissions

• 💻 If direct permission changes are not possible, use the Command Prompt as an administrator.
• 🚀 Input the command icacls "C:\Users\YOUR USER NAME\AppData\Roaming\jupyter\runtime" /grant "%username%:F" /T to grant full permissions.
• 👤 Ensure you replace YOUR USER NAME with your actual Windows username and confirm the path matches your installation.
• 🔍 To find your correct username, navigate to C:\Users in File Explorer.

Verifying the Solution

• ✅ After executing the command, try launching Jupyter Notebook again from Anaconda 3.
• ✨ The issue should be resolved, allowing Jupyter Notebook to open successfully.