Add item navigation menu OMP ERROR

Greetings

I am trying to add items in the navigation menu but when I click on the “add item” button I immediately get the error “Failed Ajax or invalid JSON returned”.

Please, how can I fix the error? My OMP version is 3.3.0.17 and PHP 8.1.2

Thank you very much

Hi @Editorial_Investigac,

For errors such as these it is advisable to check your PHP error log - can you do so and report back on any errors found there?

-Roger
PKP Team