unity runtime_error ai_generated true

InvalidOperationException: InputAction 'Player/Move' is not enabled. Cannot read value.

ID: unity/input-system-action-not-found

Also available as: JSON · Markdown · 中文
92%Fix Rate
88%Confidence
1Evidence
2023-09-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Unity 2022.3 active — — —
Unity 2023.1 active — — —
Unity 2021.3 active — — —
Input System 1.6.0 active — — —

Root Cause

An InputAction is being read via ReadValue() before it has been enabled (e.g., before InputSystem.EnableDevice or action map activation).

generic

中文

在 InputAction 启用之前（例如在 InputSystem.EnableDevice 或操作映射激活之前）通过 ReadValue() 读取该操作。

Official Documentation

https://docs.unity3d.com/Packages/[email protected]/manual/Actions.html

Workarounds

  1. 90% success Enable the action map before reading values: `InputActionMap actionMap = inputActions.FindActionMap("Player"); actionMap.Enable();` then call `inputActions.FindAction("Move").ReadValue<Vector2>();` 
    Enable the action map before reading values: `InputActionMap actionMap = inputActions.FindActionMap("Player"); actionMap.Enable();` then call `inputActions.FindAction("Move").ReadValue<Vector2>();`
  2. 95% success Use event-based callbacks instead of polling: `inputActions.Player.Move.performed += ctx => { Vector2 value = ctx.ReadValue<Vector2>(); };` 
    Use event-based callbacks instead of polling: `inputActions.Player.Move.performed += ctx => { Vector2 value = ctx.ReadValue<Vector2>(); };`
  3. 85% success Delay the first read until after InputSystem.Update() by checking `InputSystem.isInitialized` and using a coroutine. 
    Delay the first read until after InputSystem.Update() by checking `InputSystem.isInitialized` and using a coroutine.

中文步骤

  1. Enable the action map before reading values: `InputActionMap actionMap = inputActions.FindActionMap("Player"); actionMap.Enable();` then call `inputActions.FindAction("Move").ReadValue<Vector2>();`
  2. Use event-based callbacks instead of polling: `inputActions.Player.Move.performed += ctx => { Vector2 value = ctx.ReadValue<Vector2>(); };`
  3. Delay the first read until after InputSystem.Update() by checking `InputSystem.isInitialized` and using a coroutine.

Dead Ends

Common approaches that don't work:

  1. 30% fail

    Calling Enable() on the action inside Start() or Awake() may still fail if the InputSystem hasn't initialized yet.

  2. 50% fail

    Disabling and re-enabling the action map in Update() causes repeated overhead and doesn't fix timing.

  3. 60% fail

    Using InputAction.ReadValue<float>() without checking isPressed first can still throw if not enabled.