MCP error - looking for minecraft main jar... not found - minecraft

I'm trying to do my own Minecraft mod for a few months, but I'm in big trouble…
I want to install MCP for the mc Version 1.8.8, I already had 2 errors which I
could fix myself, but the 3rd error is impossible to find a solution for on the Internet.
So I already had the ScalaC not found error and the twitch error, but now I have the error: "Looking for minecraft main jar… not found".
I've found somebody on a Forum which had the same error, but nobody had a working solution.
It would be very nice if somebody could explain to me how to fix this.

Its okay. I too had the problem but found out that MCP just makes the Main jar file when its not there, read the codes. It should say :"Copying minecraft main jar... OK"

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