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I'm having trouble on an install of EE 2.8.1. This is the first time I've seen this php error, and it bugs me. It doesn't seem to be causing any real problems, but it messes up the font sizes on the CP. Any ideas on what may be causing this?

A PHP Error was encountered

Severity: Warning

Message: file_get_contents(/chroot/home/---/---/system/expressionengine/cache/current_version): failed to open stream: Permission denied

Filename: drivers/Cache_file.php

Line Number: 74

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4

Check that your cache directory's permissions are set to 777 so that it's fully readable/writeable.

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    The cache directory was 777, but the "current version" file was not. The server had set itself as the owner of the file and blocked public access to it. After a couple of rounds with tech support, we got the ownership worked out, so we're good now. No PHP error anymore.
    – user3776457
    Jan 12, 2015 at 22:38

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