Hi @sadafjamal3 !
Welcome to the forum!
Can you specify which classes you trying to join?
Are you referring to this?
It was on classcentral but now I am able to join the upcoming cohort live batch
Since this is not an official freeCodeCamp course, it would be best to reach out to Class Central or the creators of the bootcamp for any ongoing issues.
The bootcamp creators contact information is found in the article.
Hope that helps!