Extremely Broken Code Please Help!

[LFRobotics]

Okay so I applied those changes and have updated the code here:

https://github.com/FranklinMarquette/Robot2016

And it returns this error:

ERROR Unhandled exception: java.lang.IllegalArgumentException: Subsystem must not be null. at [edu.wpi.first.wpilibj.command.Command.requires(Com mand.java:194), org.usfirst.frc.team4623.robot.commands.Extend.<in it>(Extend.java:16), org.usfirst.frc.team4623.robot.OI.<init>(OI.java:5 6), org.usfirst.frc.team4623.robot.Robot.robotInit(Rob ot.java:44), edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:72), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:241)]

Thanks for the help

[TimTheGreat]

Just a quick question. Are you reading the errors or just posting them here? It's ok if you are because they aren't the most lovely things to read (though you should try. It'll be much faster) What it's giving you is what's called a stack trace. It basically tells you the path the code took before it got an error. I've added a comment on what the error tells you.

ERROR Unhandled exception: java.lang.IllegalArgumentException: Subsystem must not be null. at [
edu.wpi.first.wpilibj.command.Command.requires(Com mand.java:194),  #6
org.usfirst.frc.team4623.robot.commands.Extend.<in it>(Extend.java:16), #5
^------------This is the file-------------------------^---------------Line #- ^
org.usfirst.frc.team4623.robot.OI.<init>(OI.java:5 6), #4
org.usfirst.frc.team4623.robot.Robot.robotInit(Rob ot.java:44), #3
du.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:72), #2
edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:241)] #1

So you start at the bottom and read up. Notice how it goes to robotInit at #3, then goes into OI at 4, then to the Extend class. At Line 16 (note my comment in the code) is where the error is. Looking at line 16 in the code shows

requires(Robot.pnue);

Looking in the Robot class I can see pneu, but the problem is it's initialized AFTER OI. So OI is looking for a null object, hence the error. Try putting OI after everything.

[twiggzee]

I'm having the same problem. Compiles just fine but red light on driver station robot code.

When I comment out everything in public OI{}, I get green light on driver station robot code. But why??

TimTheGreat: What do you mean by "Try putting OI after everything"?

Thanks for your reply!

[TimTheGreat]

Originally Posted by twiggzee

I'm having the same problem. Compiles just fine but red light on driver station robot code.

When I comment out everything in public OI{}, I get green light on driver station robot code. But why??

TimTheGreat: What do you mean by "Try putting OI after everything"?

Thanks for your reply!

So in LFRobotics' code he has

        oi = new OI();
        pnue = new Pnuematics();

The problem is when you create a new OI object, it looks for robot.pneu. But as you can see pneu hasn't been created because it is after new OI(). So put new OI below the creation of everything else (in this case swap them).

[LFRobotics]

Okay that makes perfect sense. I did trace it back and could deduct that it had something to do with the extend class but never thought of movie the onus constructor

Thanks

[twiggzee]

Yes! That worked! Thanks so much, TimTheGreat!!!

[TimTheGreat]

Originally Posted by twiggzee

Yes! That worked! Thanks so much, TimTheGreat!!!

Glad I could help

[LFRobotics]

Okay so moving that fixed it. Now the pnuematics are not working.

What does this error mean?

ERROR Unhandled exception: edu.wpi.first.wpilibj.util.AllocationException: Solenoid channel 1 on module 0 is already allocated at [edu.wpi.first.wpilibj.DoubleSolenoid.initSolenoid( DoubleSolenoid.java:54), edu.wpi.first.wpilibj.DoubleSolenoid.<init>(Double Solenoid.java:81), org.usfirst.frc.team4623.robot.commands.Retract.<i nit>(Retract.java:12), org.usfirst.frc.team4623.robot.OI.<init>(OI.java:5 7), org.usfirst.frc.team4623.robot.Robot.robotInit(Rob ot.java:42), edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:72), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:241)]

I have tried moving stuff around and changing simple things but it keeps throwing the same error.

Thanks again,
Franklin

[TimTheGreat]

Is your code up to date in the github repo?

PS: A good way of reaching me is on the Freenode IRC channel #robotpy. If you're on then you can have quick discussion which is a lot faster than CD