stuck Loading chip...

[Snape]

I meet a problem
when i use Hardware simulator to load Mux.hdl and any mux-related files.  
The simulator always present " Loading chip". And stay in this state. 【picture1】
But when i load other chip which can be loaded normally. 【picture2】

However, if I load the original unedited chip, it loads fine.【picture3】

[Snape]

This is my code of Mux.hdl.

[Snape]

OMG! i find the solve.
I used the or gate in Mux, but I also used the or gate in the or gate.
So or(x) →→ Mux（x）→→gate of Mux-related（x）

thinks for this topic  ：http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/can-t-load-chip-td4036223.html