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解决办法：需要打开科学上网，刷新网页重新上传，即可上传成功，不在报错。

此外，有时候碰上上传后出现无法删除附件、关键词无法删除、无法添加作者等，页面操作无反应是因为浏览器中有插件跟页面冲突了，打开插件管理，关闭相应插件后即可进行上述操作。