Hi.

Since I've updated my vendors this morning using composer, I'm getting this error when I try to drop my database :

[ErrorException]                                                                                                                                                                                 
  Notice: unserialize(): Error at offset 82 of 84 bytes in /Users/tim/Boulot/widop/Clients/divosea/v2/code/vendor/symfony/symfony/src/Symfony/Component/Config/Resource/FileResource.php line 114

I first had trouble with the cache:clear command so I removed all the content of the app/cache directory (as told in #4626). Now, when I try to build my database, it crashes.

IMO, it's related to the PR #4619, since I had no trouble before the merge and the code throwing the exception has been modified. My coworkers had the same problem today on several development environnements (Debian, Ubuntu, Mac OS).

Let me know if you need more information about the issue.