"parsing error" when opening keepass file on android 5.1.1

I do use the Seafile client on 4 devices to sync my keepass generated passwords. And it worked well on all 4 devices. But since some time the old tablet with android 5.1.1 pops a “parsing-error” when I try to open the keepass file. The other clients (windows 10, ubuntu 16.04, androis 7.1) do still work well…

I can still open the file by starting the keepass app and selecting one of the files in history path (by guessing which ones is the current one). But if you could provide me a tip how to solve it, I would be grateful for that.

Sorry for my phrasing, englich is not my native language…