Even in some rare cases, the re-install step also doesn't work. 
iOS usually provides an option to restore settings and content from iCloud backup, if you've enabled it previously.
Finally, if you can't fix it with anything, you may need to uninstall the app and reinstall it. 
After that put it to charge, and press the power button.
If none of the above is working, you can wait till your phone battery drains and it turns off automatically. Now you can try opening the app, it may work fine. Press the power off button for a few seconds and then choose restart from the menu to restart your device. Then you close the app that has this issue. You just need to press the recent applications menu (usually the first left button) on your phone. Most of the time, it might be a temporary loading issue. There are a few ways to fix this problem. 
Usually, when you open an app, you will see a black screen for a few seconds and then the app will crash with or without an error message.
It is one of the most common problems in mobile phones and tablets.
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