I'm getting this message in the browser after I install Oracle APEX 5.1.0:
There is a problem with your environment because the Application
Express files have not been loaded. Please verify that you have copied
the images directory to your application server as instructed in the
Installation Guide. In addition, please verify that your image prefix
path is correct. Your current path is /i/ (it should contain both
starting and ending forward slashes, such as the default /i/). Use the
SQL script reset_image_prefix.sql if you need to change it.
I'm following this instruction. I'm running this instruction on Linux Fedora 23, my Oracle APEX images folder is located in /home/oracle/apex/apex/images.