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This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 12 years ago.

After updating a Wordpress, or merely doing something minor like attempting to deactivate a plugin, the site might get occasionally get stuck in a non-functional state where it merely outputs an error message like the following:

Fatal error: Call to undefined function nocache_headers() in /wp-admin/admin.php

What might be the cause for this happening?

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 12 years ago.

After updating a Wordpress, or merely doing something minor like attempting to deactivate a plugin, the site might get occasionally get stuck in a non-functional state where it merely outputs an error message like the following:

Fatal error: Call to undefined function nocache_headers() in /wp-admin/admin.php

What might be the cause for this happening?

Share Improve this question edited Sep 9, 2020 at 1:30 fuxia 107k38 gold badges255 silver badges459 bronze badges asked Dec 18, 2012 at 12:57 SteveSteve 1,75719 gold badges66 silver badges115 bronze badges
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1 Answer 1

Reset to default 7

There were wp files in the web root which had file size of 0 bytes.

Uploading proper copies from the zip file resolved the problem.

The same cause of the problem has occurred to me quite a few times in the past, but I had forgotten it.

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