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.