Error provisioning namespace. ORA-20001 Request could not be processed at Oracle Apex - oracle-apex

Question

I finally managed to install Oracle Apex 5.1.2 but I have problem with creating a workspace. Whenever I try to do so at the end I get an error:
I tried to create this workspace with following values:
The strange thing is that when I try to use Yes as option to Reuse Existing Schema no schemas are listed. Is it possible that Apex somehow doesn't have access to managing schemas?
I am using APEX with ORDS. At home page I get info that I have 1 workspace and 1 schema.
I've tried:
Using strong passwords as mentioned here
Changing provisioning type to request: Effect is the same. If user request a space and I accept it I get the exact same error.
Enabled OMF with parameter DB_CREATE_FILE_DEST = '/u01/app/oracle/oradata' -> *.dbf files are not created before and after the change in directory.

Answer 1

The root cause of this problem was installing APEX both on CDB$ROOT, so as a result, and on PDB1. I uninstalled APEX from root, repaired with #utlrp.sql script as in this tutorial and installed APEX again, but only on PDB1. Workspace was successfully created.

Answer 2

I had the same problem (apex 18.1/ords) in a database without CDB configured. The solution in my case was to run #apex_rest_config.sql script.
After that, the workspace is created without any problem.

Answer 3

If you don't want to reinstall apex to move it from the CDB to the PDB I suggest you try setting PDB mapping in your ords config file.
https://docs.oracle.com/en/database/oracle/oracle-rest-data-services/20.2/aelig/configuring-REST-data-services.html#GUID-694B2F89-CE4F-4AB0-88E2-EB35D03DEC3C
I did it by adding
<entry key="db.serviceNameSuffix"></entry>
to the end of my defaults.xml (you can find its location by running
$ java -jar ords.war configdir ).
Then access apex with /yourpdb in the path: e.g.
http://server:port/ords/pdb1
This will run apex from that PDB instead of from the CDB and will create the workspace in there, that should work OK. It did for me.

Answer 4

I had same problem at ORACLE 12c, according to this link my problem has been solved. The problem is the users can't create workspace in CDB, so you must change session container to pdf files by the following steps :
$root> cd ~/TEMP/apex
$root> sqlplus
Enter user-name: sys as sysdba
Enter password:
SQL> exec dbms_xdb.sethttpport(0); /*set port*/
SQL> alter session set container=YOURAPPEXPDB;
SQL> exec dbms_xdb.sethttpport(8181);
SQL> alter system register;
//install oracle apex again
to remove oracle apex i use this link, its perfectly worked for me.