Ok, you’ve forgotten to provide this information. If you’ve installed Nextcloud on your own and can login as admin, it should be easy to provide information about the used Nextcloud and web server version, the database etc.?! Without that information it will be difficult to find the root cause of the problem.
If I try to access your server using wget the following error is displayed:
Connecting to edunextcloud.000webhostapp.com (edunextcloud.000webhostapp.com)|145.14.145.156|:80... connected.
HTTP request sent, awaiting response... 500 Internal Server Error
2019-11-05 11:35:41 ERROR 500: Internal Server Error.
I think it will be necessary for you to check the Nextcloud log file and als the web server log file for any further information.