[ERROR] Cache directory naming error, file already exists, mkdir 'C:\Users\abc\.anyproxy\cache\cache_r636877'

Anyproxy crashed at the creating process after several times of started and closed in js code.
Infact, I haven't found a way to change a anyproxy server's rule after initializing the server. so I have to create a new one every time when the rule changed. And after a few times, one server crashed with the error shown below:

* Windows 10
* nodejs 8.3
* anyproxy 4.0.10

##### ErrorMessage:

##### the bug happened at:

##### the directory which the bug message referred:

##### config file:


I suppose it is a directory naming problem, which is seldom happened. But it happened! So please make some effort to improve it's usability!