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This error occurs when the gradio module is not installed in your system. You can fix this error by installing the gradio module on your machine. To install the gradio module, follow the below steps:

1. Open your terminal or command prompt.
2. Enter "pip install gradio" or "pip3 install gradio" and press enter.
3. Wait for the installation process to complete.
4. Once completed, import the gradio module in your program by adding the following line at the top of your code:

import gradio as gr

1. Save your program and try running it again. The error should no longer appear.