Please help with this error message

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(day ago I was changing some CSS and then clearing cache via administration)
one day later there is following error message:

Warning: require_once(Zend/Date/DateObject.php): failed to open stream: No such file or directory in /data/web/virtuals/63292/virtual/www/concrete/libraries/3rdparty/Zend/Date.php on line 25

Fatal error: require_once(): Failed opening required 'Zend/Date/DateObject.php' (include_path='.:/data/web/virtuals/63292/virtual') in /data/web/virtuals/63292/virtual/www/concrete/libraries/3rdparty/Zend/Date.php on line 25

Not sure, how to solve it.
Thanks for your help.

 
jasteele12 replied on at Permalink Reply
jasteele12
The file is either gone or not readable by the web server.

I would start with a fresh copy of the concrete directory, or a backup.
chiron replied on at Permalink Reply
Thanks for your effort. But I can read error messages.. :)
Maybe I should mention that these files are there in place for sure (I double checked that).

However, it is caused by Concrete5 caching mechanism (somehow not working properly)..

When I delete Zend cache files manually then it works..

Hope this help to others, because it is quite often problem (previously) without
known solution in this forum.
jasteele12 replied on at Permalink Reply
jasteele12
Never seen c5 caching cause anything like that, ever.

Is varnish caching enabled on your host? If so, you want that disabled...