Help building NetworkTables

Hello i have been having trouble while trying to build networktables here is a link to a github with my code

when i try to build it this is the error that i get

C:\Users\Desktop\GradleTest>gradlew build
:compileJava
C:\Users\Desktop\GradleTest\src\main\com\djsprinkles\gradle\Main.java:3: error: package edu.wpi.first.wpilibj.networktables does not exist
import edu.wpi.first.wpilibj.networktables.NetworkTable;
                                          ^
C:\Users\Desktop\GradleTest\src\main\com\djsprinkles\gradle\Main.java:8: error: cannot find symbol
                NetworkTable.setClientMode();
                ^
  symbol:   variable NetworkTable
  location: class Main
C:\Users\Desktop\GradleTest\src\main\com\djsprinkles\gradle\Main.java:9: error: cannot find symbol
                NetworkTable.setTeam(TEAM);
                ^
  symbol:   variable NetworkTable
  location: class Main
C:\Users\Desktop\GradleTest\src\main\com\djsprinkles\gradle\Main.java:10: error: cannot find symbol
                NetworkTable.initialize();
                ^
  symbol:   variable NetworkTable
  location: class Main
C:\Users\Desktop\GradleTest\src\main\com\djsprinkles\gradle\Main.java:11: error: cannot find symbol
                NetworkTable table = NetworkTable.getTable("Test");
                ^
  symbol:   class NetworkTable
  location: class Main
C:\Users\Desktop\GradleTest\src\main\com\djsprinkles\gradle\Main.java:11: error: cannot find symbol
                NetworkTable table = NetworkTable.getTable("Test");
                                     ^
  symbol:   variable NetworkTable
  location: class Main
6 errors
:compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 2.491 secs

I am very new to gradle so i may be doing something very obvious wrong.