IPad pages的com.apple.documentmanager错误1

本人iPad AIR 5

打开page文档，创建空白文档出现com.apple.documentmanager错误1

，如图

pages已经重新安装，还会出现以上问题

如何解决？

My device is iPad Air 5

When I opened PAGES to create a new document, error "com.apple.documentmanager错误1" came out.

I deleted the application,PAGES and redownload it ,but the error still exists.

Please tell me how to solve the problem, thank you。