Admin-plugin bug report: clear cache not working properly

Hi!

I just came over the problem, that the "Clear all cache" gives a "Internal Server Error". I tried to clear the cache for assets, images and cache only seperatly. The error is shown on clear asset-cache (and because of this also on clear all).

I`m using currently the antimatter-skeleton without any modifications, all on the newest versions updatetd.

Clear_cache

Regards; siren