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It apparently seem like a duplicate question (Undefined 'post_type' error on Add new page), I've tried solving since a last few hours along with researching and now it's time to ask from experts.

I tried using the following two ways to create nonce field from add_meta_box callback function.

wp_nonce_field( 'meta_slider_noncename', 'abc');

and

 <input type="hidden" name="my_nonce" value="<?php echo wp_create_nonce('the_nonce'); ?>">

Upon inspecting the Add New Page from CPT, the nonce field is actually added. I am using it in theme, not plugin.

and from save_post callback function, I tried this as suggested in other ways to confirm if $_POST key isset and nonce exists

if (!isset($_POST['abc'])) {
    return;
  }

    if(!wp_verify_nonce($_POST['abc'],'meta_slider_noncename')) {
    return;
    }

but the error still persists. What am I doing wrong here?

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