Fatal error: Uncaught Error: Call to undefined function SilverStripe\Core\Manifest\json_decode() in /app/vendor/silverstripe/framework/src/Core/Manifest/Module.php:200
Stack trace:
#0 /app/vendor/silverstripe/framework/src/Core/Manifest/Module.php(60): SilverStripe\Core\Manifest\Module->loadComposer()
#1 /app/vendor/silverstripe/framework/src/includes/constants.php(213): SilverStripe\Core\Manifest\Module->__construct('/app', '/app')
#2 /app/vendor/composer/autoload_real.php(73): require('/app/vendor/sil...')
#3 /app/vendor/composer/autoload_real.php(63): composerRequirebffb9eb5bc294369427da250b962748e('795b01cf23ed94c...', '/app/vendor/com...')
#4 /app/vendor/autoload.php(7): ComposerAutoloaderInitbffb9eb5bc294369427da250b962748e::getLoader()
#5 /app/public/index.php(15): require('/app/vendor/aut...')
#6 {main}
thrown in /app/vendor/silverstripe/framework/src/Core/Manifest/Module.php on line 200