Samsung Galaxy ace Q problem

[Savage31]

I have a samsung galaxy ace Q
My problem is I have a white triangle with a black exclamation mark in it
It"s in the top left corner
It just pop up today
How do I get rid of it

Thanks

 

[insekticide]

There should be something explaining the exclamation mark. You might not have sufficient space left or an app was not successfully installed. The solution depends on the problem.