ajax on button throw exception The specified #ajax callback is empty or not callable

Solutions

Change your callbacks to be like this:

'callback' => [$this, 'catSelectedCallback'],

Not totally sure but I think that the problem is that both buttons (addTermsBtn and addFieldsBtn) have the same #value. Try to use different #value for the buttons or use #name attribute for differentiate them.

Tags: Forms / Drupal 8 / Ajax

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