DCATADMIN
Hi
The gif file is giving 404 error even if correct url added,
First you should update Ad Adgency to latest version.
Now open site root folder .htaccess file this file is used to add redirections rule, Its not clear what type of rule you added, so i suggest you to rename it with any other name and create a new .htaccess or remove the codes one by one.
take backup of site and .htaccess before updates.