When you try to generate your application and you see this error, there are two possible options:
1. Our servers's ram is hitting the limit.
2. You are using an invalid package name.
In case of situation 1, this is not your fault. You can try to generate your app again later, or you can contact us: firstname.lastname@example.org if the problem persists.
Remember: You can always use the offline version, you can download it from your CodeCanyon profile --> Downloads.