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Try settings-apps-all-media storage,force stop and clear data.Restart your phone.
Are you sure it say your sd card is full???
I never get notifactions for low memory on sd card...i receive just for internal storage
Beside what alexdon said also check camera setting and see what is storage location
Goto setting>storage erase sd card or format your sd card by pc
You could try to format your sd card.
You can format from settings-storage.
Well do this
First goto setting>xperia>usb connectivity>usb connection mode change it to "mass storage mode"
Then connect phone to pc then a new drive will appear on my computer windows..then right click on it and click on format..after a new window opend then click on format button
But formating will erase all of data on SD CARD so if you have anything on sd card copy them to pc before format