APEX 18.2, ORDS 18.4. DB 12C.
I face the above error when running any page. APEX's file that fail to load is "app-icon.css". And a non-APEX file that I uploaded and it just have the following code,
function test(){console.log('hi')}
I start the ORDS in standalone mode:
java -jar ords.war standalone
At first I had an error said that, -- I do not remember the exact message but it was something like the following,
"document root is disabled because it can not find the path"
The path lacked for a folder named doc_root. So, I created it. The message was changed thereafter to,
INFO: The document root is serving static resources located in: d:\ords\config\ords\standalone\doc_root
But, still the browser couldn't load the files.
Edited:
I have the following warnings to in the cmd when starting the ORDS in standalone mode,
WARNING: *** jdbc.MaxLimit in configuration |apex|| is using a value of 10, this setting may not be sized adequately for a production en
nment ***
وµغ 03, 2020 1:31:44 ╒
WARNING: *** jdbc.InitialLimit in configuration |apex|| is using a value of 3, this setting may not be sized adequately for a production
ironment ***
وµغ 03, 2020 1:31:45 ╒
WARNING: The pool named: |apex|al| is invalid and will be ignored: The connection pool named: |apex|al| is not correctly configured, due
the following error(s): ORA-28001: the password has expired
وµغ 03, 2020 1:31:45 ╒
WARNING: The pool named: |apex|pu| is invalid and will be ignored: The connection pool named: |apex|pu| is not correctly configured, due
the following error(s): ORA-28001: the password has expired
وµغ 03, 2020 1:31:45 ╒
WARNING: The pool named: |apex|rt| is invalid and will be ignored: The connection pool named: |apex|rt| is not correctly configured, due
the following error(s): ORA-28001: the password has expired
That's when I have the PASSWORD_LIFE_TIME = UNLIMITED,

also tried to validate the ORDS using,
java -jar ords.war validate [--database <dbname>]
where <dbname> was replaced with my db name "orcl".
But the problem still exists. I do not remember if I upgraded the ORDS or APEX or else. It was along time ago.