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lain chan's source code based imageboard that I was lurking is crashed, this is the error from post.php Do you know what is the problem?

First thing I would check is the permissions on the directory where the file failed to be written. Second, I find it weird that a php file would be cached, but I don't know what kind of framework is being used.

They use Twig templating. Looks like they fuarrrked up an inclusion into a template, which probably created a recursive loop.