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After updating my Xperia S on Jb, continuously getting the error message by popup on the screen that
"LOW STORAGE SPACE"
There i s not enough storage space available to complete this action. Please clear some space and try again.
Anybody know ,How to fix it.. 
settings > apps > move the apps to the internal storage
have moved almost all the apps, still there is 560 mb left memory , and it's still showing the problem 
go to settings > storage > take screenshots and post it here
happened in my sony ericsson live with walkman running ICS, a Reboot Fixed it.