A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = ''E:\Website\Dvbcn\wp-content\themes\skin\cache\timB5BC.tmp

Query String : h=124&src=https%3A%2F%2Fmp.toutiao.com%2Fmp%2Fagw%2Farticle_material%2Fopen_image%2Fget%3Fcode%3DZjg0YmY1NjQ4MmJiYzdjY2ZhZjI4ZGEzZTQ1YmI3YWUsMTcxOTQ1MTU5ODM1OA%3D%3D&w=218&zc=1
TimThumb version : 2.8.13