TimThumb Error

The following error(s) occurred:

• Cache file could not be loaded.

Query String: src=%2Fimages%2Fhairextension%2FLaser_Hair_Extension_Training_in_Shiraz.jpg&w=90&h=64&zc=1
TimThumb version: 2.8.14
Instruction: Thumbnails don't work — what to do? (registration required)