I hit this issue testing Drupal CMS. Patching with #56 resolved the problem for me. Adding the Drupal CMS dependency tag on this issue since it seems to block the ability to install new languages in Drupal CMS.
unfortunately this did not resolve the issue. I wrote a very basic patch for my version that seems to "work" (or at least work around the fatal error). This simply comments out:
//PhpStorageFactory::get('trash')->deleteAll();
mikemadison → created an issue.
the patch applies cleanly to dev.
applying the patch seems to address the issue i was having. thanks for the quick turn around!
mikemadison → created an issue.
laura.gates → credited mikemadison → .
laura.gates → credited mikemadison → .
laura.gates → credited mikemadison → .
it would be awesome if we could get this merged. this is the last blocking item on one of my sites to get to d10!