Make setup instructions more clear

SETUP.md

@@ -47,6 +47,8 @@ You can verify whether or not it worked by running `.b version` in chat (only va
 ## Command Line
 On Mac OSX and Linux, use `./gradlew` instead of `gradlew`.
 
+If you have errors with a package missing please make sure you have setup your environment, and are using Oracle JDK 8.
+
 Setting up the Environment:
 
 ```
@@ -54,6 +56,12 @@ $ gradlew setupDecompWorkspace
 $ gradlew --refresh-dependencies
 ```
 
+Building Baritone: 
+
+```
+$ gradlew build
+```
+
 Running Baritone:
 
 ```
@@ -87,16 +95,6 @@ For information on how to build baritone, see [Building Baritone](#building-bari
   
   ![Image](https://i.imgur.com/hrLhG9u.png)
 
-# Building
-
-Make sure that you have properly [setup](#setup) the environment before trying to build it.
-
-## Command Line
-
-```
-$ gradlew build
-```
-
 ## IntelliJ
 
 - Navigate to the gradle tasks on the right tab as follows