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/dt-48em-sicaklik-kontrol-cihazlari-48x48-dijital-ekran-j-k-s-r-t-resim-336000.webp&w=500&h=500&zc=
TimThumb version : 2.8.14