APPLICATION ERROR #2800 Invalid form security token error in mantis

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when i creating category showing

APPLICATION ERROR #2800 Invalid form security token. This could be caused by a session timeout, or accidentally submitting the form twice. Please use the “Back” button in your web browser to return to the previous page. There you can correct whatever problems were identified in this error or select another action. You can also click an option from the menu bar to go directly to a new section.

Please let me know how to solve this issue.

Thanks

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Open mantis directory folder i.e. mantis/config/config_inc.php

set security_validation in OFF mode if it’s on.

$g_form_security_validation = OFF;

Go to your browser and Crtl+Shift+R for hard refresh and try. it should work.

Answered question