After updating MediaWiki from 1.32.6 to 1.33 I get this:
/wiki/index.php/System_Administration/Servers/epoch MWException from line 183 of /var/www/wiki/includes/MagicWord.php: Error: invalid magic word 'testopia'
Backtrace:
#0 /var/www/wiki/includes/MagicWordFactory.php(222): MagicWord->load(string) #1
/var/www/wiki/includes/parser/Parser.php(5288): MagicWordFactory->get(string) #2
/var/www/wiki/includes/StubObject.php(112): Parser->setFunctionHook(string, string) #3
/var/www/wiki/includes/StubObject.php(138): StubObject->_call(string, array) #4
/var/www/wiki/extensions/TestopiaReports/TestopiaReports.php(63): StubObject->__call(string, array) #5
/var/www/wiki/includes/Setup.php(906): efTestopiaReportsSetup() #6 /var/www/wiki/includes/WebStart.php(81): require_once(string) #7 /var/www/wiki/index.php(41): require(string) #8 {main}
Happens because there is LanguageGetMagic on line 56 TestopiaReports.php, which was removed in 1.33.
How to fix: http://followthescore.org/dpldemo/index.php/Issue:LanguageGetMagic_is_deprecated