OCI ATP Born APEX Instance Not Working

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Always-Free Tier ATP born APEX instance has been working fine for about a year.  Today suddenly, I am getting the following message:

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  (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.