Failed to Open Stream /vendor/phpoffice/phppresenation/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php

  autoload, php, phppresentation, symfony

Attempting to run an API with PHP PowerPoint generation by inclusion of a script with an auto loader pointing to my vendor directory under a custom /api/libraries/PhpPresentation directory results in a warning.

Warning:
require(C:wamp64wwwprojectaimapilibrariesPhpPresentationvendorphpofficephppresentationvendorcomposer/../symfony/polyfill-mbstring/bootstrap.php):
failed to open stream: No such file or directory in
C:wamp64wwwprojectaimapilibrariesPhpPresentationvendorphpofficephppresentationvendorcomposerautoload_real.php
on line 70

enter image description here

How do I fix this?

Source: Symfony Questions

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