Cannot proceed after new installation

[josithg]

after installing openCats version 0.9.7.4 i went through the installation steps after i that clicking start openCats it is showing internal error 500

i new to php so please be specific about the instructions to fix thank you

josithg@localhost /var/www/html/opencats (heads/master*) $ uname -a                       
Linux localhost 6.17.0-14-generic #14~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 15 15:52:10 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

josithg@localhost ~ $ php -v 
PHP 7.2.34-61+ubuntu24.04.1+deb.sury.org+1 (cli) (built: Feb 13 2026 15:53:37) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.34-61+ubuntu24.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies

josithg@localhost ~ $ cd /var/www/html/opencats

josithg@localhost /var/www/html/opencats (heads/master*) $ ls 
ajax             CHANGELOG.MD   constants.php  images             issue_template.md  modules           rebuild_old_docs.php  temp    xml
ajax.php         ci             db             index.php          js                 not-ie.css        rss                   test
attachments      composer.json  docker         INSTALL_BLOCK      lib                optional-updates  scripts               upload
careers          composer.lock  Error.tpl      installtest.php    LICENSE.md         QueueCLI.php      Security.MD           vendor
careersPage.css  config.php     ie.css         installwizard.php  main.css           README.md         src                   wsdl

josithg@localhost /var/www/html/opencats (heads/master*) $ composer install         
Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Nothing to install, update or remove
Generating autoload files
1 package you are using is looking for funding.
Use the `composer fund` command to find out more!

Thank you