I’m currently trying to work with access rights in my block plugin.
Moodle version 4.3.7
The file is located in the blocks/lbtb/ folder

To do this, I entered the following into access.php:

 $capabilities = array(

 'block/lbtb:canreadlbtbblock' => array(
     'captype' => 'read',
     'contextlevel' => CONTEXT_SYSTEM,
     'archetypes' => array(
         'editingteacher' => CAP_ALLOW,
         'manager' => CAP_ALLOW
     ),
 ),

 'block/lbtb:canwritelbtbblock' => array(
     'riskbitmask' => RISK_SPAM | RISK_XSS,

     'captype' => 'write',
     'contextlevel' => CONTEXT_BLOCK,
     'archetypes' => array(
         'editingteacher' => CAP_ALLOW,
         'manager' => CAP_ALLOW
     ),
 ),

);

I would like to enable the query with has_capability.
This is what my file looks like where I want to query:

    use core_externalutil as external_util;
require_once(__DIR__ . '/../../config.php');
class block_lbtb extends block_base {
    function init() {
        $this->title = get_string('pluginname', 'block_lbtb');
    }

    function has_config(){
        return true;
    }

    public function get_content() {
        global $DB, $CFG, $OUTPUT;
        if ($this->content !== NULL) {
            return $this->content;
        }

         $this->content = new stdClass;

         // Add logic here to define your template data or any other content.

         $getswconfig = get_config('block_lbtb', 'sw');
         $getszconfig  = get_config('block_lbtb', 'sz');

         $contextblock = context_system::instance();

         if (has_capabilty('block/lbtb:canwritelbtbblock', $contextblock)) {
             $visibility = '';
            } else {
               $visibility = 'display: none;';
            }

         if ($getswconfig == 0) {
            $getsw = 'lbtbbuttongreen';
         } else {
            $getsw = 'lbtbbuttonred';
         }

         if ($getszconfig == 0) {
            $getsz = 'lbtbbuttongreen';
         } else {
            $getsz = 'lbtbbuttonred';
         }

         $data = [
            'buttoncolorsw' => $getsw,
            'buttoncolorsz' => $getsz,
            'visibility' => $visibility,
         ];

         $this->content->text = $OUTPUT->render_from_template('block_lbtb/content', $data);

         return $this->content;
    }
}

I get this error:

Fehler: Call to undefined function has_capabilty()

Debug info:
Error code: generalexceptionmessage
Stack trace:
line 34 of /blocks/lbtb/block_lbtb.php: Error thrown

Line 34:

if (has_capabilty('block/lbtb:canreadlbtbblock', $contextblock)) {