Python和多线程系统。excepthook缺失

So I have many files to download from a server. Over 1000... So I thought I'd write a script that would do this for me that is multithreaded so that I don't have to wait for ages for it to finish. The problem is that it spits out a bunch of errors. I have searched for this but couldn't really find anything that seemed to be related to the error that I'm having as I don't print out any output in my other threads.So I have many files to download from a server.