Updating ojs 3.3.0.14 to 3.3.0.15

Hi,
after updating ojs 3.3.0.14 to 3.3.0.15, I have the following error:
**Fatal error**: Uncaught Error: Class 'APP\Services\IssueService' not found in /public_html/ojs/classes/services/OJSServiceProvider.inc.php:66
My version of PHP 7.4.33
Can you help me thank you.