Fatal error: Uncaught TypeError: core\router::guess_basepath(): Return value must be of type string, null returned in /var/lms/moodle/lib/classes/router.php:115
Stack trace:
#0 /var/lms/moodle/lib/classes/router.php(79): core\router->guess_basepath()
#1 /var/lms/moodle/lib/php-di/php-di/src/Definition/Resolver/ObjectCreator.php(129): core\router->__construct(Object(core\router\response_handler), Object(core\router\route_loader), Object(core\router\request_validator), Object(core\router\response_validator), NULL)
#2 /var/lms/moodle/lib/php-di/php-di/src/Definition/Resolver/ObjectCreator.php(56): DI\Definition\Resolver\ObjectCreator->createInstance(Object(DI\Definition\ObjectDefinition), Array)
#3 /var/lms/moodle/lib/php-di/php-di/src/Definition/Resolver/ResolverDispatcher.php(60): DI\Definition\Resolver\ObjectCreator->resolve(Object(DI\Definition\ObjectDefinition), Array)
#4 /var/lms/moodle/lib/php-di/php-di/src/Container.php(353): DI\Definition\Resolver\ResolverDispatcher->resolve(Object(DI\Definition\ObjectDefinition), Array)
#5 /var/lms/moodle/lib/php-di/php-di/src/Container.php(136): DI\Container->resolveDefinition(Object(DI\Definition\ObjectDefinition))
#6 /var/lms/moodle/lib/php-di/php-di/src/CompiledContainer.php(65): DI\Container->get('core\\router')
#7 /var/lms/moodle/lib/classes/di.php(62): DI\CompiledContainer->get('core\\router')
#8 /var/lms/moodle/r.php(54): core\di::get('core\\router')
#9 {main}
thrown in /var/lms/moodle/lib/classes/router.php on line 115