I'm suddently getting this error message whenever I want to edit a page:
Error: Class 'ProcessWire\WireMail' not found (line 58 of /home/somedir/www/foo/wire/core/WireMailTools.php)
It results in server error 500.
I'm certainly never touching anything in the wire folder, the WireMail files are all there.
Has anybody an idea what causes this? I'm practically blocked.