Hello,
NewsPress Extend has no such issues. These are hosting issues. You should have more resources to run NewsPress Extend because it is designed to handle thousands of visitors. You should remove NewsPress Extend from WordPress Dashboard and re-install the theme again. If the theme doesn’t run, you should contact with your host for more resources and/or optimize your WordPress Installation. Please read This Article first to last with all replies. You will find a part describing this low server resources issues.
Thanks