Unfortunately we cannot reproduce your issue when testing Parse Server in a fresh instance. Is it possible that you changed some configuration of your server and then, you started to experience problems?
In order to find the source of the errors, could you check the apache logs and all the log files that you may find in the
/opt/bitnami/apps/parse/htdocs/logs/ directory right after you reproduce the issue?
Also, could you check if your storage disk is full?