Last Update November 5, 2020: We improved the overall article.

There’s a bug in OpenX on some installations where this error is displayed when trying to login:

After logging in, you get this warning:

Error: File permission errors detected.
These may impact the accurate delivery of your ads,
See the debug.log file for the list of files unwritable

OpenX Cache Permissions

Basically error was coming from

grep -lnR 'Error: File permission errors detected.' /public_html/openx/
Result: /public_html/openx/lib/OX/Extension/authentication/authentication.php

As you can see, that authentication.php on line #171.:

OA_Admin_UI::queueMessage('Error: File permission errors detected.
These may impact the accurate delivery of your ads,
See the debug.log file for the list of unwritable files', 'global', 'error', 0);

Here is how to fix it:
Open the flowing file authentication.php from here in this location OpenXlibOXExtensionauthentication
Add the following code to line 102.“print_r($vals[‘error’]);” to line #5, right after ‘($env == ‘PERMS’) ‘

if ($env == 'PERMS') {
print_r($vals['error']);
 // Just note that some file/folders are unwritable and that more information can be found in the debug.log
OA_Admin_UI::queueMessage('Error: File permission errors detected.
These may impact the accurate delivery of your ads,
See the debug.log file for the list of unwritable files', 'global', 'error', 0);
                }

You may need to run the maintenance script for it to go away though and or wait for it to run automatically.

/public_html/openx/plugins
/public_html/openx/www/admin/plugins
/public_html/openx/www/images

Hope you will now solve this problem

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