PHP Fatal Error when site moved

I have moved a new 8.4 site to a different server from my local environment
Moved all site files and db, but did not move cache or tmp
Permissions are correct
Configuration database.php file correct
Result: white screen of death - completely empty page
PHP v5.6.3

From Apache error log:
PHP Fatal error:  Interface 'Psr\\Cache\\CacheItemPoolInterface' not found in /var/www/example/public/concrete/vendor/tedivm/stash/src/Stash/Interfaces/PoolInterface.php on line 24

Has anyone experienced this before? Would appreciate any insight you might have.

View Replies:
A3020 replied on at Permalink Reply
Check if the file exists in /vendor/psr/cache/src/CacheItemPoolInterface.php. If not, something went wrong while copying the files.