You just need to press the recent applications menu (usually the first left button) in your phone.
Usually when you open an app, you will see a black screen for few seconds and then app will crash with or without an error message. It is one of the most common problem in android operating system.
Common BLM - Software Laundry Android App Problems and Troubleshooting Steps ✅ I'm getting black screen / white screen (blank screen) when I open BLM - Software Laundry Android?
