After the installation of react-navigation/web, expo cannot be located within this project.

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There could be a few reasons why this is happening, but here are some possible solutions:

1. Make sure you have installed Expo globally on your machine using npm install -g expo-cli. If you haven't installed Expo globally, then your project won't be able to locate it.

2. Check your project's package.json file and ensure that Expo is listed as a dependency. If it's not, then you can add it using npm install expo.

3. Restart your development server and see if that solves the problem. Sometimes, after installing new packages, you need to restart your server for the changes to take effect.

4. If none of the above solutions work, then you could try uninstalling and reinstalling react-navigation/web using npm uninstall react-navigation/web and npm install react-navigation/web. This may reset any configuration issues that could be causing the problem.

Hopefully, one of these solutions will solve your problem and allow you to locate Expo within your project.