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The solution to the version error of Laravel guzzlehttp/guzzle involves updating the version of the package:

1. Open the composer.json file in the root directory of your Laravel project.
2. Look for the "guzzlehttp/guzzle" package and check its version.
3. Update the version to a compatible one that works with your Laravel version.
4. Run the command "composer update" in your terminal to update the package.
5. If the problem persists, try deleting the vendor folder and the "composer.lock" file and then run "composer install" to reinstall all packages.
6. If none of the above solutions work, try removing the "guzzlehttp/guzzle" package and then reinstalling it.

Note: Always make sure to check the compatibility of the packages you want to install with your Laravel version before installing them.