/PHP/Symfony/Symfony check:requirements Fatal error: Using $this when not in object context in C:\Users\Admin\.symfony\cache\check.php on line 778 exit status 255

Symfony check:requirements Fatal error: Using $this when not in object context in C:\Users\Admin\.symfony\cache\check.php on line 778 exit status 255

Just define an older version of php 7 to be used by your symfony system with:
echo 7 > .php-version
You can check your php version used by your symfony white marked with following:
symfony local:php:list

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