Solving PlayerInput Error | Official Unity Discord | Page 1

rapid wedge Mar 11, 2026, 5:33 AM

#

Hi there,
I'm doing a tutorial series to learn how to make an on-rails shooter to protoype some ideas. The tutorial is a few years old, but I'm on Unity 6000.1.12f1.
Tutorial (Stuck on Part 2): https://www.youtube.com/watch?v=-sbBkRrVQZg&list=PLnJJ5frTPwROHmPx61qjFk9BBYczWt-Nu&index=3

I'm stuck on the second video because I can't seem to get my ship to aim and I've messed around my code for answers so much that for whatever reason I can no longer move my ship around like I previously could either. I'm looking at my console for clues, but the only thing I see is the following error:

UnityEngine.Debug:LogError (object,UnityEngine.Object)
KBCore.Refs.SceneRefAttributeValidator:ValidateRef (KBCore.Refs.SceneRefAttribute,UnityEngine.Component,System.Reflection.FieldInfo,object) (at ./Library/PackageCache/com.kylewbanks.scenerefattribute@8d3a0ee42158/SceneRefAttributeValidator.cs:442)
KBCore.Refs.SceneRefAttributeValidator:Validate (UnityEngine.Component,System.Collections.Generic.IList`1<KBCore.Refs.ReflectionUtil/AttributedField`1<KBCore.Refs.SceneRefAttribute>>,bool) (at ./Library/PackageCache/com.kylewbanks.scenerefattribute@8d3a0ee42158/SceneRefAttributeValidator.cs:186)
KBCore.Refs.SceneRefAttributeValidator:Validate (UnityEngine.Component,bool) (at ./Library/PackageCache/com.kylewbanks.scenerefattribute@8d3a0ee42158/SceneRefAttributeValidator.cs:120)
KBCore.Refs.SceneRefAttributeValidator:ValidateRefs (UnityEngine.Component,bool) (at ./Library/PackageCache/com.kylewbanks.scenerefattribute@8d3a0ee42158/SceneRefAttributeValidator.cs:105)
RailShooter.InputReader:OnValidate () (at Assets/Settings/InputReader.cs:35)*```

Double clicking this error doesn't take me to my InputReader Script, but rather a random script in a document called SceneRefAttributeEditor.cs to the line saying: ```Debug.LogError($"{c.GetType().Name} missing required {elementType?.Name + (isCollection ? "[]" : "")} ref '{field.Name}'", c.gameObject);```
I haven't touched this as I don't know what it's talking about.

I've attached the InputReader and WeaponSystem scripts I'm working with. I was experimenting using CoPilot for the first time tonight to fix up any errors or fix any code I copied from the tutorial that for some reason didn't work, so somethings may be wrong though I tried to copy and correct it as best as I could. If someone could help me get a handle on this, I'd greatly appreciate it as it's holding me up a lot and I've had this problem for a while. Also, please explain this clearly if you figure out what is wrong, I am an artist and intermediate coder who doesn't code often, not an advanced programmer.

Note: That the KB Core stuff is based on some library imported in the first video. The above link is a playlist link, so you can navigate to that if you need to for info.

📎 WeaponSystem.cs 📎 InputReader.cs

YouTube

git-amend

Build a Rail Shooter in Unity: Aim While Moving (Part 2)

Shooting straight ahead is boring! Let the Player Aim and Shoot while moving along the rail in this second episode of our Rail Shooter Game Development Series. We're going to use some smoke and mirrors, invisible to the player, to create a unique and very FUN aiming system that looks good and feels good.

🔔 Subscribe for more Unity Tutorial...

▶ Play video

autumn sand Mar 11, 2026, 5:34 AM

#

please share your code properly

#

!code

wary helmBOT Mar 11, 2026, 5:34 AM

#

autumn sand !code

Posting code

📃 Large Code Blocks

Use links to services like:
https://paste.mod.gg/, https://hastebin.skyra.pw/, https://paste.ofcode.org/, https://paste.myst.rs/

📃 Inline Code

Surround code with three backquotes. Not quotation marks.
To format as C#, add cs to the first line:
```cs
// Your code here
```
Add a comment with a line number if there is an error message.

autumn sand Mar 11, 2026, 5:34 AM

#

it seems pretty straightforward though

#

your inputreader doesn't have the PlayerInput assigned

#

have you done so?

rapid wedge Mar 11, 2026, 5:35 AM

#

But where do I put that and how

#

I tried looking it up but nothing I've tried has worked

autumn sand Mar 11, 2026, 5:35 AM

#

rapid wedge But where do I put that and how

what message is this meant to reply to? if you're asking about the code, the bot message has instructions

rapid wedge Mar 11, 2026, 5:37 AM

#

autumn sand what message is this meant to reply to? if you're asking about the code, the bot...

Okay, here's the InputReader code
https://paste.ofcode.org/bvJB7uEG3XWrAsgGb9bYrm

#

I cannot tell what is incorrect here

#

Here's the Weapon System Code if that's relevant because I can't get aiming to work either.
https://paste.ofcode.org/z4inaiexctuafch3M76i2t

autumn sand Mar 11, 2026, 5:41 AM

#

autumn sand your inputreader doesn't have the PlayerInput assigned

have you assigned the PlayerInput to the InputReader

rapid wedge Mar 11, 2026, 5:41 AM

#

No and that's also what confuses me. The inspector offers no slots to put anything in.

#

Because I figured I would do that, but there are no options

#

rapid wedge Mar 11, 2026, 5:44 AM

#

autumn sand have you assigned the PlayerInput to the InputReader

Isn't that what SerializedField is supposed to do?

autumn sand Mar 11, 2026, 5:45 AM

#

rapid wedge Isn't that what SerializedField is supposed to do?

no, serialized field means it's assignable, but you still have to assign it

rapid wedge Mar 11, 2026, 5:45 AM

#

autumn sand no, serialized field means it's *assignable*, but you still have to assign it

Okay, so how would I do that here?

autumn sand Mar 11, 2026, 5:45 AM

#

rapid wedge

have you tried restarting unity?

rapid wedge Mar 11, 2026, 5:45 AM

#

Yes, this is an issue I've had for days.

autumn sand Mar 11, 2026, 5:45 AM

#

do other components have visible fields?

rapid wedge Mar 11, 2026, 5:45 AM

#

Nope, not on Input reader

#

See above screenshot

autumn sand Mar 11, 2026, 5:46 AM

#

i asked about other components

#

does this issue affect other components

rapid wedge Mar 11, 2026, 5:46 AM

#

You mean the other scripts? Yes they do.

#

I can assign things on the other scripts just fine

autumn sand Mar 11, 2026, 5:46 AM

#

might be that there's a custom inspector for this component that's not working correctly

rapid wedge Mar 11, 2026, 5:47 AM

#

autumn sand Mar 11, 2026, 5:47 AM

#

try setting the inspector to debug mode

#

oh you're aslo getting the playerinput on Awake

#

not sure why your playerinput is serialized then

#

you're missing a PlayerInput component entirely

#

(though, the missing inspector fields is still an issue)

rapid wedge Mar 11, 2026, 5:48 AM

#

Okay, NOW I see something on DebugMode, but I still can't seem to edit anything in that script.

autumn sand Mar 11, 2026, 5:49 AM

#

whatever Self is, seems to be disabling assigning to that field?

#

going off the other components

autumn sand Mar 11, 2026, 5:49 AM

#

autumn sand you're missing a PlayerInput component entirely

but yeah you're just missing a playerinput component on this object

rapid wedge Mar 11, 2026, 5:50 AM

#

Okay, where would I put that in the code and how?

autumn sand Mar 11, 2026, 5:50 AM

#

you would not

#

you would put a playerinput component on this object

rapid wedge Mar 11, 2026, 5:50 AM

#

I do have that on the game object

autumn sand Mar 11, 2026, 5:50 AM

#

could you show that then

rapid wedge Mar 11, 2026, 5:50 AM

#

autumn sand Mar 11, 2026, 5:51 AM

#

and it's on the same gameobject?

rapid wedge Mar 11, 2026, 5:51 AM

#

Yep

#

autumn sand Mar 11, 2026, 5:52 AM

#

just as a sanity check, try hovering over the PlayerInput type in InputReader, make sure it's the one from InputSystem and not one defined in RailShooter

#

well i suppose OnValidate would be running before Awake.

rapid wedge Mar 11, 2026, 5:52 AM

#

Yep, it's pointing to itself when I check

#

In debug mode

autumn sand Mar 11, 2026, 5:53 AM

#

oh yeah it is assigned there

#

is that console error new/persistent?

rapid wedge Mar 11, 2026, 5:53 AM

#

Yep on start

autumn sand Mar 11, 2026, 5:53 AM

#

maybe it's just an old error?

rapid wedge Mar 11, 2026, 5:53 AM

#

Before, I could use WASD to move the ship a bit, but now I can't. I must've broke something when I tried to fix it

autumn sand Mar 11, 2026, 5:54 AM

#

is the playerinputactions set as the default input actions asset?

rapid wedge Mar 11, 2026, 5:55 AM

#

How would I check that

autumn sand Mar 11, 2026, 5:55 AM

#

i believe it would be in input system settings

#

if it is, then it should be enabled by default.
if not, then you'd have to enable it yourself

rapid wedge Mar 11, 2026, 5:56 AM

#

This thing?

autumn sand Mar 11, 2026, 5:56 AM

#

yeah

#

so yeah you don't seem to be enabling the inputactions anywhere, that could be it

rapid wedge Mar 11, 2026, 5:57 AM

#

YEP! That did it! Things are kinda working now and the error is gone. Thanks

autumn sand Mar 11, 2026, 5:57 AM

#

i don't think this would be related to the error actually

rapid wedge Mar 11, 2026, 5:57 AM

#

Oh

autumn sand Mar 11, 2026, 5:58 AM

#

i suspect it's just something weird with the validatedmonobehaviour and the Self attribute

#

those aren't unity built-ins

rapid wedge Mar 11, 2026, 5:59 AM

#

autumn sand i don't think this would be related to the error actually

Oh wait never mind

#

Things are working again, BUT the error is still here afterall

rapid wedge Mar 11, 2026, 6:05 AM

#

autumn sand those aren't unity built-ins

Are they from the KB Core thing?

autumn sand Mar 11, 2026, 6:09 AM

#

no clue

#

try hovering over them

#

they should show what namespace they're from

rapid wedge Mar 11, 2026, 6:09 AM

#

autumn sand they should show what namespace they're from

Yeah, it says they're based on KBCore

#Solving PlayerInput Error

📃 Large Code Blocks

📃 Inline Code