Hii!
If you are facing such problems, there may be a number of reasons for that. May be your phone android version doens't support the current version of the app, may be the phone storage isn't enough and hinders the app to run properly, may be you need to grant certain permissions before it starts working, or the app may be poorly developed or unauthorised.
So, kindly check for all this conditions. You may find a solution.
Hope this helps.
Good luck!