[IntelliJ] Trying to set up Gradle, exception at line 21

[WoodSphinx]

Hey there! This is my first time posting, sorry if this in the wrong place or in the wrong format.
I've installed Java 8 JDK, IntelliJ IDEA and the Forge MDK, and I have the latest version of 64-bit Java. I'm trying to set up Gradle for the first time, following several tutorials, and I keep getting an exception at line 21.

Anyone know how I can solve this, or have any suggestions at least? 

Edited April 20, 2017 by WoodSphinx
adding information

[Choonster]

Post your build.gradle file in a code block.

 

I recommend against using the setupDevWorkspace or idea Gradle tasks. I suggest you follow this guide (specifically the "Terminal-free IntelliJ IDEA configuration" section) to set up your workspace.

[Leomelonseeds]

Also try running gradlew.bat in the forge folder.