Notice: Undefined variable: sourcefile in

[phpstudyone]

浏览器地址输入
locaLHOST/thumbers/d/10,d_flickr.png
返回：
Notice: Undefined variable: sourcefile in C:\wamp\www\source\evaThumber\src\EvaThumber\Thumber.php on line 385

Fatal error: Uncaught exception 'EvaThumber\Exception\IOException' with message 'Dummy file name conflict with exsit file ' in C:\wamp\www\source\evaThumber\src\EvaThumber\Thumber.php:383 Stack trace: #0 C:\wamp\www\source\evaThumber\src\EvaThumber\Thumber.php(271): EvaThumber\Thumber->process() #1 C:\wamp\www\source\evaThumber\index.php(49): EvaThumber\Thumber->show() #2 {main} thrown in C:\wamp\www\source\evaThumber\src\EvaThumber\Thumber.php on line 383

不明白需要配置些什么。