A TimThumb error has occured

The following error(s) occured:

The image being resized is not a valid gif, jpg or png.

Query String : src=../images/urunler/MULTISER-T-03-PC-TFT-Sebeke-Analizoru-Sicaklik-Olcumlu-resim-350311.webp&w=500&h=500&zc=
TimThumb version : 2.8.14