Oracle Apex : Failed to load resource: the server responded with a status of 404 ()

Environment:

In our case,

Apex: 19.2.0.00.18
Tomcat: apache-tomcat-9.0.36
ORDS: 19.1

Error:

Developer reported Dashboard images and themes are not loading for one of the Application developed using Oracle Apex.

When working with developer, we could notice the following error in an “Inspect Element” from Chrome.

“Failed to load resource: the server responded with a status of 404 ()” in multiple places.

Cause:

Some of the apex user accounts created during installation of ORDS(Oracle Rest Data services) were expired and locked.

Workaround:

ALTER USER APEX_LISTENER IDENTIFIED BY your_password ACCOUNT UNLOCK;
ALTER USER APEX_REST_PUBLIC_USER IDENTIFIED BY your_password ACCOUNT UNLOCK;
ALTER USER APEX_PUBLIC_USER IDENTIFIED BY your_password ACCOUNT UNLOCK;