it has happened twice to me today. I am trying to set a new instance of Jaspersoft AWS. As soon as i have tried to delete the users predefined by the Jasper instance, afterwrds the instance is not accessible anymore, and it returns back the following error:
You should be able to delete any sample users without any issue. But I have never tried deleting *all* users. I am guessing that if you delete the user "jasperadmin" and/or the user "superuser" that there might be problems.
Which users are you deleting and which ones are you leaving in place?