problem with downloading apps for my mobile

[Android Question]

i download app for my mobile phone but she can't be instaled on mobile,it said thaht instalation on USB or SD card can't be possible ... what can i do to fix that, because i really need apps for my mobile phone ( samsung galaxy mini s5570)

 

[Brian706]

Try going into settings>storage>unmount sd card

Then try to install. If it works, mount the sd card again afterward.