I've been working on upgrading from MW 1.27 to 1.30. As part of that upgrade I found that LiquidThreads broke more (depreciated functions) and figured I'd check out Flow. Unfortunately trying out the converter on a test page ran across this Exception.
$ php convertLqtPageOnLocalWiki.php --srcpage Draft_talk:QC_a_maintenance --logfile=/tmp/flow.log [96e8cdd1ead0d9d5e8769fd0] [no req] InvalidArgumentException from line 229 of mw30/w/extensions/Flow/vendor/pimple/pimple/src/Pimple/Container.php: Identifier "memcache.local_buffered" is not defined. Backtrace: #0 mw30/w/extensions/Flow/maintenance/convertLqtPageOnLocalWiki.php(33): Pimple\Container->extend(string, Closure) #1 mw30/w/maintenance/doMaintenance.php(92): ConvertLqtPageOnLocalWiki->execute() #2 mw30/w/extensions/Flow/maintenance/convertLqtPageOnLocalWiki.php(87): require_once(string) #3 {main}