Move App to SD card

[USAFmedicVET]

Galaxy S4. I want to move IMDB app (for example) to SD card. It's not grayed out & plenty of space. I press move to SD card & get error message: "unable to move app". Any simple FIX on this recurring problem?

 

[Titillating]

You'll need to root your phone. Not exactly a 'simple' fix. Even if you move the app over through other methods, the Android OS by default does not run apps off of SD cards. Only way around it is to root.