an error occurred when I open the Acrobat Reader on my iPad Pro

When I open the Acrobat Reader app on my iPad, it crashed and jumped back to iPad home page, then I used iTune to review all my pdf files in this app, I can see all in the list so I copied all onto my laptop.  It showed an error message when I copied one folder (412 KM) onto the computer.  The message was "XXX (the folder's name) could not be copied due to an error occurred.  A duplicate file name is specified."  So what can I do for this?  Is it possible for me to uninstalled this app from my iPad, then re-instal again?  Will all my files stored in the app lost?