What can cause error: Previous Definition Different

[Suliman via Digitalmars-d-learn]

On Wednesday, 4 May 2016 at 10:01:54 UTC, Suliman wrote:
> After some minor modification of my code I begun to get error:
>  Error 1: Previous Definition Different : 
> _D3app14onlinetestdataFC4vibe4http6server17HTTPServerRequestC4vibe4http6server18HTTPServerResponseZv
>
> Here is my code: 
> https://gist.github.com/bubnenkoff/db0632bb14eebb7690b6563c47395831
>
> Is there any ideas?

The error is cause because two different routers was link on same 
handler.