Several Could not copy file errors

Hi

MODX 3.1.1. Any ideas why I keep getting these Copy errors in red when I try to reinstall extras? It might be a permissions problem but I have tried deleting the extra named folders and I still get these errors.

xPDOCacheManager->copyFile(): Could not copy file /homepages/44/88888888/htdocs/MODX/core/packages/pthumb-2.3.3-pl/modCategory/c3bb45aa4f1b3bc69d5e0bbd434a67f9/0/phpthumbof/lexicon/en/default.inc.php to /homepages/44/88888888/htdocs/MODX/core/components/phpthumbof/lexicon/en/default.inc.php
Could not copy file /homepages/44/88888888/htdocs/MODX/core/packages/pthumb-2.3.3-pl/modCategory/c3bb45aa4f1b3bc69d5e0bbd434a67f9/0/phpthumbof/lexicon/en/default.inc.php to /homepages/44/88888888/htdocs/MODX/core/components/phpthumbof/lexicon/en/default.inc.php; could not create directory.