Advertising needs network. It may be that your network connection is suddenly disconnected, so you can't get the advertisement normally, so it will show that the advertisement pull failed. Another possibility is that the advertisement has been obtained at the end, and no new advertisement has been refreshed, so the pull failure will be displayed.
Shenyang Qidian Software Co., Ltd. is a high-tech enterprise specializing in software research and development, large-scale website construction and maintenance, and providing solutions for information management of enterprises and institutions.