Gutenberg block in theme : integrate your own block initially as a plugin to a theme and error peticion – WordPress

I created a block initially as a plugin with the latest wordpress block.json architecture that worked and appeared within gutenberg but when integrating it to the theme I get an error of the url request error.

add_action('init', 'register_my_block');
function register_my_block(){
    register_block_type(
        __DIR__. '/myblocks', 
        array(        
            'render_callback' => 'render_my_block_posts'
    ));
}

Also use register_block_type_from_metadata() but got the same error

Example error in console:

https://domain.local/wp-content/plugins/D:/xampp/htdocs/wp-content/themes/NewsPaper/inc/gutenberg/myblocks/index.js?ver=d395fe5d9d90bd6565685c91d8d38888

A correct call is made to the php file of the functions to the file but when registering the request it goes wrong for the block

The code from block.json

{
    "$schema": "https://json.schemastore.org/block.json",
    "apiVersion": 2,
    "name": "block/custompost",
    "version": "1.0.0",
    "title": "CustomPosts",
    "category": "widget",
    "icon": "grid-view",
    "description": "Display a custom post.",
    "keywords": [ "grid" , "gridview" , "custompost" ],
    "textdomain": "default",
    "attributes": {
        "columns": {
            "type": "number",
            "default": 3
        },
        "rows": {
            "type": "number",
            "default": 9
        },
        "display": {
            "type": "string",
            "default": ""
        },
        "display_setting": {
            "type": "array",
            "default": []
        "edit_mode": {
            "type": "boolean",
            "default": true
        }
    },
    "supports": {
        "align": [ "wide" , "full"],
        "html": false
    },

    "editorScript": "file:./index.js",
    "editorStyle": "file:./custompost.css"
}