two warnings during upgrade about directory not empty

Saw this while upgrading.

Warning: rmdir(/home/andrew/Desktop/tempdata/moodledata/dev/master/cache/cachestore_file/default_application): Directory not empty in /home/andrew/Desktop/code/moodle/dev/master/lib/moodlelib.php on line 9440 Call Stack #TimeMemoryFunctionLocation 10.0042367344

{main}( )../index.php:0 217.422744295160upgrade_noncore( )../index.php:393 325.801144805176purge_all_caches( )../upgradelib.php:1603 426.218144815440remove_dir( )../moodlelib.php:1594 526.218444816104remove_dir( )../moodlelib.php:9429 626.218544816872remove_dir( )../moodlelib.php:9429 726.245644817000rmdir ( )../moodlelib.php:9440
( ! ) Warning: rmdir(/home/andrew/Desktop/tempdata/moodledata/dev/master/cache/cachestore_file): Directory not empty in /home/andrew/Desktop/code/moodle/dev/master/lib/moodlelib.php on line 9440 Call Stack #TimeMemoryFunctionLocation 10.0042367344{main}

( )../index.php:0 217.422744295160upgrade_noncore( )../index.php:393 325.801144805176purge_all_caches( )../upgradelib.php:1603 426.218144815440remove_dir( )../moodlelib.php:1594 526.218444816104remove_dir( )../moodlelib.php:9429 626.267844816248rmdir ( )../moodlelib.php:9440