Preferences table Null Pointer Exception

[L1TH1UM]

Hello,

We are having some issues using the preferences table utility on SmartDashboard. We are supposed to be getting a table from which we can edit robot preferences such as potentiometer setpoints and encoder setpoints.

However, when we run the code it throws a Null Pointer Exception because we declared the preferences varable (Preferences prefs but we didn't create and object and we are trying to use an operator (prefs.getDouble). Using "prefs = new Preferences();" does not work, and there's nothing on the wpilibj documentation that tells us how to fix this (create an object for preferences).

Here's the page we're referencing: https://wpilib.screenstepslive.com/s...smartdashboard

Our code is almost exactly the same as that just minor differences such as names and values. We are programming in Java.

Any help would be appreciated, thanks.