Thread:Extension talk:ConfirmEdit/The current version of this extension is not compatible with 1.20/reply (8)

I'm getting the same issue:

[74137648] 2014-11-06 01:04:27: Fatal exception of type MWException

When I set "$wgShowExceptionDetails = true;" in LocalSettings.php, it gets expanded to:

[3fec957a] /index.php?title=Special:UserLogin&returnto=Main+Page&type=signup Exception from line 161 of     /example.com/htdocs/extensions/ConfirmEdit/FancyCaptcha.class.php: Ran out of captcha images

For previous people participating in this thread, a similar error turned out to be wrong location of the images. Here, it's not the case:

$wgCaptchaDirectory = "/tmp/captcha";

# ls /tmp/captcha/ image_0c30eb32_909fdf4961658cbf.png image_4b5777ea_02ea373d0eb70a08.png  image_7c662fed_bb479185e2e52234.png (...)

Any ideas what can be wrong? This is with MediaWiki 1.23.6.