Try doing any of this:
Clear Cache
Clear Data
Re-install
Clearing it from your tabs and relaunch it again
Force Stop the app
Re-download & install.
If (at least) the first 3 solutions don't work, post the screenshot and tell about the problem in the thread of the mod.
Also, you got this in the wrong section xD
This is 'Answered Questions' if you didn't notice xD