Fatal error when activating plugin

Hello.

I get fatal error. Can you help me?

Fatal error: Uncaught Error: syntax error, unexpected '|', expecting variable (T_VARIABLE)
in /var/www/html/wp-content/plugins/next-active-directory-integration/vendor-repackaged/psr/log/src/LoggerInterface.php on line 30

Call stack:

{closure}()
spl_autoload_call()
wp-content/plugins/next-active-directory-integration/vendor-repackaged/monolog/monolog/src/Monolog/Logger.php:40
require_once()
wp-content/plugins/next-active-directory-integration/vendor-repackaged/autoload.php:10
{closure}()
spl_autoload_call()
wp-content/plugins/next-active-directory-integration/src/plug-in/Log/Logger.php:11
include_once()
wp-content/plugins/next-active-directory-integration/autoload.php:49
{closure}()
spl_autoload_call()
wp-content/plugins/next-active-directory-integration/src/plug-in/Log/NadiLog.php:60
Dreitier\N\L\NadiLog::createLogger()
wp-content/plugins/next-active-directory-integration/src/plug-in/Log/NadiLog.php:42
Dreitier\N\L\NadiLog::getInstance()
wp-content/plugins/next-active-directory-integration/src/plug-in/Requirements.php:30
Dreitier\Nadi\Requirements::__construct()
wp-content/plugins/next-active-directory-integration/index.php:33
include_once()
wp-admin/includes/plugin.php:2318
plugin_sandbox_scrape()
wp-admin/plugins.php:192
Query Monitor

Parse error: syntax error, unexpected '|', expecting variable (T_VARIABLE) in /var/www/html/wp-content/plugins/next-active-directory-integration/vendor-repackaged/psr/log/src/LoggerInterface.php on line 30

Fatal error: Exception thrown without a stack frame in Unknown on line 0