Whenever I am trying to open an app, most of them won't open with the error as below.

I am really helpless here. Is there is any issue with my machine?

I have a Ubuntu background and recently started using OS X.

Mac version :

enter image description here

  • What version of OSX? Go to the  menu and select "about this Mac" – bjbk Feb 1 '16 at 15:58
  • Tip: take a screenshot of a window by pressing ⇧⌘3 then Space, then click a window, or ⌥-click to remove the shadow. – grg Feb 1 '16 at 16:04
  • 1
    @grgarside... ⇧⌘4 then Space ;) – Tetsujin Feb 1 '16 at 17:41
  • 1
    I wonder if this is that expired certificate issue? Do you have the latest version of Mac OS? – Steve Chambers Feb 1 '16 at 21:48
  • 1
    Apple let a vital certificate expire that signed a bunch of apps. Bad on them, but keeping your O/S updated in this day and age is more than just "A Good Idea" Any OS manufacturer can and has made egregious mistakes. The trick is, how they respond. And Apple cleaned this one up pretty quickly, – Steve Chambers Feb 1 '16 at 23:30

Apple let a vital App Store certificate apply, unfortunately. Update your OS and that should fix the issue.

While this does not speak well for Apple, many OS manufacturers have had critical (or if you will stupid) flaws in their OS. Which makes it a good idea to keep up to date on released updates in the App store.

| improve this answer | |

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .