Running the latest MW LTS version (1.31.3) and the latest Lockdown 1.31 version (381da77 from 1.12.2018).
This is what I get on my test install on every page view:
```
Warning: include(/html/secret-wiki-test/mediawiki/extensions/Lockdown/Lockdown.alias.php): failed to open stream: No such file or directory in /html/secret-wiki-test/mediawiki/includes/cache/localisation/LocalisationCache.php on line 524
Warning: include(/html/secret-wiki-test/mediawiki/extensions/Lockdown/Lockdown.alias.php): failed to open stream: No such file or directory in /html/secret-wiki-test/mediawiki/includes/cache/localisation/LocalisationCache.php on line 524
Warning: include(): Failed opening '/html/secret-wiki-test/mediawiki/extensions/Lockdown/Lockdown.alias.php' for inclusion (include_path='/html/secret-wiki-test/mediawiki/vendor/pear/console_getopt:/html/secret-wiki-test/mediawiki/vendor/pear/mail:/html/secret-wiki-test/mediawiki/vendor/pear/mail_mime:/html/secret-wiki-test/mediawiki/vendor/pear/net_smtp:/html/secret-wiki-test/mediawiki/vendor/pear/net_socket:/html/secret-wiki-test/mediawiki/vendor/pear/pear-core-minimal/src:/html/secret-wiki-test/mediawiki/vendor/pear/pear_exception:.:') in /html/secret-wiki-test/mediawiki/includes/cache/localisation/LocalisationCache.php on line 524
```
Hope somebody can fix this.
Regards,
Stefan