Migrate prestashop server

hi ,
i have moved my prestashop from one server to another i put ll credential but i still have an error showing

Warning: include(/home/techhaico/public_html/vendor/composer/../../src/Core/ContainerBuilder.php): failed to open stream: No such file or directory in /home/techhaico/public_html/vendor/composer/ClassLoader.php on line 444

Warning: include(): Failed opening '/home/techhaico/public_html/vendor/composer/../../src/Core/ContainerBuilder.php' for inclusion (include_path='/home/techhaico/public_html/vendor/pear/pear_exception:/home/techhaico/public_html/vendor/pear/console_getopt:/home/techhaico/public_html/vendor/pear/pear-core-minimal/src:/home/techhaico/public_html/vendor/pear/archive_tar:.:/usr/lib/php:/usr/local/lib/php') in /home/techhaico/public_html/vendor/composer/ClassLoader.php on line 444

Fatal error: Class 'PrestaShop\PrestaShop\Core\ContainerBuilder' not found in /home/techhaico/public_html/config/bootstrap.php on line 34

can anyone help me ?

pleas if you contact me make sure you can work on it right away and with teamviewer .

Thank you