APEX Instance Not Working

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Always-Free Tier ATP datawarehouse was stopped to due not using for a time .  Today i started it, and  I am getting the following message when i want to get in to apex:

"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."