There isn't anything to be done when the application force closes, because it indicates there is a problem with the app or with the operating system where the app was installed. Unfortunately, the only thing you can do is to report this issue to the developer, but avoid mentioning you're using it on Bluestacks, because this environment is emulated and support for beta or 3rd party ways to run Android won't be supported.
Use the following email address to get in touch with the developer: [email protected]
