When I want to setup this workspace, I get the error of JEI, I remove that from the build, it will build fine!
Then when I want to mod (in IDEA or Eclipse) it doesn't accept it. And I know this is not much information, but this is how for I got to this, and I can't get it to build!
So my questions is: can you give me the steps to make this workspace??

What exact Errors did you get in which steps of the setup/build and which branch did you use to to setup the project in the first place? If it's the master-dev one, the reason may be that it's still on Gradle version 2.4 which for some reason is not working correctly with maven repositories.

I fixed it! Thanks for the help!