IO exceptions while saving screen shot in android devices

I am getting these exception while saving screenshot in android devices.

IOException: Disk full. Path /storage/emulated/0/Android/data/com.ksg.kite.flight.apps/SavedScree..

Managed Stack Trace:

System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options)
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
System.IO.File.Create (System.String path, Int32 bufferSize)
System.IO.File.Create (System.String path)
System.IO.File.WriteAllBytes (System.String path, System.Byte[] bytes)
MyShare+<CapturingSS>c__Iterator0.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)


IOException: Too many open files
Managed Stack Trace:

System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options)
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
System.IO.File.Create (System.String path, Int32 bufferSize)
System.IO.File.Create (System.String path)
System.IO.File.WriteAllBytes (System.String path, System.Byte[] bytes)
MyShare+<CapturingSS>c__Iterator0.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)


UnauthorizedAccessException: Access to the path "/storage/emulated/0/Android/data/

Managed Stack Trace:

System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options)
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
System.IO.File.Create (System.String path, Int32 bufferSize)
System.IO.File.Create (System.String path)
System.IO.File.WriteAllBytes (System.String path, System.Byte[] bytes)
MyShare+<CapturingSS>c__Iterator0.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)

Code (CSharp):

1. string filePath;
2.  
3. Texture2D ss = new Texture2D( Screen.width, Screen.height, TextureFormat.RGB24, false );
4.         ss.ReadPixels( new Rect( 0, 0, Screen.width, Screen.height ), 0, 0 );
5.         ss.Apply();
6.  
7.  
8.         filePath = Application.persistentDataPath + "/../SavedScreen.png";
9.  
10.         File.WriteAllBytes( filePath, ss.EncodeToPNG() );

In player settings write permission is set to internal.
Your feedback is highly appreciated.