I need help with MCP

[RazerIUP]

Hello, This is my First post there and first time using MCP and Eclipse, Intellij

So i was trying to get it working for like 8hours now and still cant get it running, but finnaly got really close to end, i thing because im only getting error from one file. When i had errors from almost all of the files.

I'm using Intellij and MCP940 (Latest) and when it was running i did get like 7 errors but i ignored them. but i do have what it said 

ScreenShot of those errors from CMD : https://prnt.sc/s6crev 

And now i got everything setup the folders, launch setting etc.

and when i tried to launch i got loads of error but they were from one folder called : AdvancementManager. but i somehow fixed it and then the error went to file named : PlayerAdvancements. but i also somehow fixed by replacing them. 

and now i get error from file named : MethodsReturnNonnullByDefault 

Heres a screenshot of it : https://prnt.sc/s6cqdg 

Any help will help. Thanks.