Unable to move app to SD card

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http://forum.xda-developers.com – recently i have faced a problem that, when I try to move a movable app from phone to SD it says unable to move because enough space available but I have about 8gb free space in SD....could any one help please...im using SGSII JB 4.1.2 and flashed Omega Thanks in advance. Sent from my GT-I9100 using xda premium (HowTos)