System plugins doesn`t work OJS 2.4.8.1

[ctgraham]

You will need to find the error message associated with this HTTP 500 error in your webserver’s PHP error log.

When I click some button or follow some link, I'm left with a blank page. What do I do?

Check your webserver error log Usually, this indicates that a PHP error has occurred and the message has been sent to your web server or system log file. Check there – e.g. /var/log/apache/error.log, although the exact location will depend on your server configuration – for further details. Check your file permissions If you haven’t installed OJS yet, then the most likely cause is a problem with file permissions in your cache/ or cache/t_compile directories. See docs/README for information on…

If you are not familiar with where your webserver’s PHP error log is found, check with your System Administrator or with your Hosting Provider for details.