If you don't have an internet connection, you can try the following steps to debug and fix the issue:
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Check if the class 'x' is present in your project's codebase. If it is not, then you need to add it.
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Check if the class 'x' is present in your project's composer.json file. If it is not, then you need to add it to the 'require' or 'require-dev' section depending on your use case.
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Check if the class 'x' is present in any of the packages that you have installed via composer. If it is, then you need to make sure that the package is installed correctly and that the autoloading is set up correctly.
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Check if the autoloading is set up correctly in your project's composer.json file. Make sure that the 'autoload' section is set up correctly and that the paths to your classes are correct.
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If none of the above steps work, then you can try running the following command to clear the composer cache:
composer clear-cache
This will clear the composer cache and might help in resolving the issue.
If you still can't resolve the issue, then you might need to connect to the internet and run the necessary composer commands to fix the issue.