Couldn't save screenshot storage may be in use.

Recently i faced this problem that my screenshot will not be saved and i would get an error as storage may be in use.Not only the screenshot was the problem,the Gallery app would say external storage not available and would close and the Camera app would say unfortunately the camera has stopped working.

 
I face this issue when i was reverting from Unofficial cm-13 by bryan to Unofficial stable cm-11 by SultanxDx for the Galaxy S2 Skyrocket SGH-I727.
The main problem was for installing the cm-13 i had to format my internal storage,data etc. using ext4 partion but the default partition is FAT32.When reverted back i forgot to format the internal storage,data etc to FAT32 partition.


So for You To fix this Problems follow these below steps:

1. Goto CWM or TWRP Recovery.
2. Select Wipe and then Advanced Wipe
3. Then Select the Internal Storage,Data,Cache,Dalvik Cache and then click format.
4. Then select the FAT32 Partition and click wipe.
5. Then perform the clean install of the OS.

It is because the new OS cm-12 and cm-13 are using virtual partitions which needs EXT4 partiton but the old builds are using FAT32 Partition.

This is the only problem which can be solved by the above problems............