It means you are missing phar extension, you will face this error until php will show:
php -i | grep phar –color=always
Registered PHP Streams => https, ftps, compress.zlib, compress.bzip2, php, file, glob, data, http, ftp, zip, phar
Phar-based phar archives => enabled
Tar-based phar archives => enabled
ZIP-based phar archives => enabled
phar.cache_list => no value => no value
phar.readonly => On => On
phar.require_hash => On => On