Hi, I've been using https://apex.oracle.com/ to practice SQL and I am getting the following error which has never happened before today:

I tried a simple query

SELECT SYSDATE FROM dual;

And this is the result:

Access Denied

  You don't have permission to access "http://apex.oracle.com/pls/apex/wwv_flow.show" on this server.

Reference #18.6dc47b68.1588986583.100d5eb1

Please assist.