Undefined constant "FILENAME_MFA

After upgrade to 2.1.0 we are not able to access the admin page anymore. We are getting the following error:

[07-Jan-2025 15:58:25 UTC] PHP Fatal error: Uncaught Error: Undefined constant "FILENAME_MFA" in ########/includes/init_includes/init_admin_auth.php:67
Stack trace:
#0 includes/autoload_func.php(40): require_once()
#1 includes/application_top.php(40): require('/home/ebtwyjvw/...')
#2 #######/home.php(9): require('/home/ebtwyjvw/...')
#3 ########/index.php(16): require('/home/ebtwyjvw/...')
#4 {main}
thrown in ########/includes/init_includes/init_admin_auth.php on line 67

This should be defined in a file called includes/filenames.php.

Perhaps a plugin you installed overwrote that file with an older version?

Thank you! That works mostly. We still get the 500 error, but when clicking "reload" it will open admin page. Following error in logs now:

[07-Jan-2025 16:54:06 UTC] PHP Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in #########/includes/init_includes/init_log_manager.php:116
Stack trace:
#0 #########/includes/init_includes/init_log_manager.php(116): implode(Array, ', ')
#1 #########/includes/autoload_func.php(40): require_once('/home/#########/...')
#2#########/includes/application_top.php(40): require('/home/#########/...')
#3 #########/home.php(9): require('/home/#########/...')
#4 #########/index.php(16): require('/home/#########/...')
#5 {main}
thrown in #########/includes/init_includes/init_log_manager.php on line 116

There is no file called init_log_manager.php in Zen Cart 2.1.0. Was this a plugin?

FabulousandFun:

Thank you! That works mostly. We still get the 500 error, but when clicking "reload" it will open admin page. Following error in logs now:

[07-Jan-2025 16:54:06 UTC] PHP Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in #########/includes/init_includes/init_log_manager.php:116
Stack trace:
#0 #########/includes/init_includes/init_log_manager.php(116): implode(Array, ', ')
#1 #########/includes/autoload_func.php(40): require_once('/home/#########/...')
#2#########/includes/application_top.php(40): require('/home/#########/...')
#3 #########/home.php(9): require('/home/#########/...')
#4 #########/index.php(16): require('/home/#########/...')
#5 {main}
thrown in #########/includes/init_includes/init_log_manager.php on line 116
That's coming out of the Log Manager plugin (https://www.zen-cart.com/showthread.php?221939-Log-Manager-Support-Thread). Make sure you've got the most recent version (v1.3.0) installed.

Possible? We have the fedexwebservices & SqaureWebPay plugins. I'll look to see if that file is a part of one of those.

Thank you I will check the version we have installed.

Thank you lat9 that did the trick. We are no longer getting the 500 error message at the admin page.