Not allowed access – theme ajax problem

Hello everyone,
I’ve been searching until now and i wasn’t able to fix my ajax code in the theme. I have created an app for my visitors, to receive some reports.

After each ajax call from non-logged in (simple visitors) i get “You are not allowed to access this part of the site”. The plugin works fine when i’m logged in as admin.

functions.php

add_action('wp_ajax_nopriv_serp_analiza', 'ajax_serp_analiza');
    add_action('wp_ajax_serp_analiza', 'ajax_serp_analiza');

    add_action('template_redirect', 'init_seoboost');
    function init_seoboost(){
        wp_enqueue_script('ajax-request', get_template_directory_uri() . '/framework/js/seoboost.js',array('jquery'));
        wp_localize_script('ajax-request', 'SB_ajax', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ), 'nextNonce'=>wp_create_nonce( 'myajax-next-nonce' )));

    }

function ajax_serp_analiza(){
    die("End, i can't reach this text");
}

seoboost.js

var j=jQuery;
var SEOBOOST=function(){
    this.analiza=function(hemail,cuv){
        var id=33201;
        var data={
            action: 'serp_analiza',
            kw:cuv,
            email:hemail,
            cid:id,
            nextNonce : SB_ajax.nextNonce
        };
        //"https://seoboost.ro/wp-admin/admin-ajax.php"
        j.post(SB_ajax.ajaxurl, data, function(response) {
            j("#analiza").html("<p>"+response+"</p>");
        });
    }
}
j(document).ready(function(){
    j("#trimtie").click(function(){

        var email=j("#email").val();
        var site=j("#site").val();
        var kw=j("#kw").val();
        j("#analiza").html("Va rugam sa asteptati cateva secunde cat timp raportul este generat!");

        var seo=new SEOBOOST;
        seo.analiza(email,kw);
    });
});

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I’m not sure why the “wp_ajax_nopriv_serp_analiza” does not work, or there is other issue ?
I can access even if not-logged in the page admin-ajax and i receive a 0 as it should, but seems that the post request from a non-user is the problem.

Thanks in advance for any of your responses!