No lessons in Java Core

Unfortunately I cannot tell you the troubleshooting. But the CodeGym staff are the most competent to deal with this type of problem: " Contact us: We’re always ready to help. You can ask any questions about the course or your learning issues by contacting our support team. Write your message through the website chat (click on the button in the lower right corner to start a conversation) or send an email to support@codegym.cc. You will receive the response within a few hours. You can also ask a question on our Facebook page. Our office HiTech Rush Inc. Address: 1201 N Orange St Suite 7553 Wilmington, DE 19801-1186, USA Phone: +16464800563 "