A TimThumb error has occured

The following error(s) occured:

Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.

Query String : src=..%2Fimages%2Furunler%2F100999_awox-watso-5726_2.jpg&w=400&zc=2
TimThumb version : 2.8.14