PHP Error: mkdir(): Invalid path

This error relates to Version 1.6.6.X and above.


Any of the following warnings/errors are related to the same known issue and can be resolved by applying the fix below.


Other symptoms include seeing 404 error pages after the installation of version 1.6.6.X


Message: mkdir(): Invalid path

Filename: drivers/Session_files_driver.php

Line Number: 136


File: /file/path/to/application/libraries/Admin_controller.php

Line: 91

Function: library


File: /file/path/to/application/controllers/Index.php

Line: 5

Function: __construct


Warning: Uncaught Exception: Session: Configured save path '' is not a directory, doesn't exist or cannot be created. in /file/path/to/system/libraries/Session/drivers/Session_files_driver.php:138


Parse error: syntax error, unexpected '/' in /file/path/to//application/config/config.php on line 385

Fatal error: Exception thrown without a stack frame in Unknown on line 0


A PHP Error was encountered

Severity: Error

Message: session_start(): Failed to initialize storage module: user (path: )

Filename: Session/Session.php

Line Number: 143


The following are extracts of error/warning messages that may appear at the beginning of a warning message





The following are extracts of warnings/errors that may appear within a warning message

('Session', 'CI_', NULL, 'session')

('Session', NULL, NULL)


The Solution:


1. Using an FTP program, go to your arpReach installation directory and download:




2. Using Notepad or a similar TEXT editor (not Word), open the file and search for:

$config['sess_save_path'] = NULL;


... around line 385.

3. Change NULL to either:




... or your server's temp folder path. The line should now read:

$config['sess_save_path'] = '/tmp';

4. Save the file and upload it back to:



... replacing the existing file on location.

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