Apps (q)force closes when i try to write to file

[powerpoint45]

I need to write text to backgroundcache.text in the folder sdcard/spinlauncher, but when I run the code it force closes and on log cat it says "failed binder transaction"

 try {
		OutputStreamWriter cache = new OutputStreamWriter(openFileOutput("/sdcard/spinlauncher/backgroundcache.txt",MODE_APPEND));
		cache.write("this is text");
		cache.close();
		cache.flush();
	} catch (java.io.IOException e) {
		
	}

Any suggestions

 

[powerpoint45]

I used filewriter and it worked so don't worry about this question