cannot connect to database after update from 2.1

[bhu73]

cloned repo, restored database from current 2.1 version, copied config files, updated dependencies with composer.phar ,verified database connectivity on the commandline , but web interface says cannot connect to database.
syspasslog says. :-

[2021-11-26 14:38:43] syspass.EXCEPTION: logger {"message":"(P) Unable to connect to DB
#0 /opt/syspass/lib/SP/Storage/Database/Database.php(216): SP\Storage\Database\MySQLHandler->getConnection()
#1 /opt/syspass/lib/SP/Storage/Database/Database.php(175): SP\Storage\Database\Database->prepareQueryData()
#2 /opt/syspass/lib/SP/Storage/Database/Database.php(136): SP\Storage\Database\Database->doQuery()
#3 /opt/syspass/lib/SP/Repositories/Plugin/PluginRepository.php(451): SP\Storage\Database\Database->doSelect()
#4 /opt/syspass/lib/SP/Services/Plugin/PluginService.php(292): SP\Repositories\Plugin\PluginRepository->getEnabled()
#5 /opt/syspass/lib/SP/Plugin/PluginManager.php(462): SP\Services\Plugin\PluginService->getEnabled()
#6 /opt/syspass/app/modules/web/Controllers/BootstrapController.php(117): SP\Plugin\PluginManager->getEnabledPlugins()
#7 /opt/syspass/app/modules/web/Controllers/BootstrapController.php(70): SP\Modules\Web\Controllers\BootstrapController->getPlugins()
#8 [internal function]: SP\Modules\Web\Controllers\BootstrapController->getEnvironmentAction()
#9 /opt/syspass/lib/SP/Bootstrap.php(240): call_user_func_array()
#10 [internal function]: SP\Bootstrap->SP{closure}()
#11 /opt/syspass/vendor/klein/klein/src/Klein/Klein.php(879): call_user_func()
#12 /opt/syspass/vendor/klein/klein/src/Klein/Klein.php(588): Klein\Klein->handleRouteCallback()
#13 /opt/syspass/lib/SP/Bootstrap.php(464): Klein\Klein->dispatch()
#14 /opt/syspass/lib/Base.php(75): SP\Bootstrap::run()
#15 /opt/syspass/index.php(28): require('/opt/syspass/li...')
#16 {main}","caller":"N/A"}

composer.phar said :-

Package jeremeamia/superclosure is abandoned, you should avoid using it. Use opis/closure instead.
Package fzaninotto/faker is abandoned, you should avoid using it. No replacement was suggested.
Package phpunit/dbunit is abandoned, you should avoid using it. No replacement was suggested.
Package phpunit/php-token-stream is abandoned, you should avoid using it. No replacement was suggested.
Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested.

I have two other webapps using the same database englne with php that work fine.
Any thoughts?