# InvalidOperationException: Cannot rebind action 'Jump' because the control 'Keyboard/space' is already bound to action 'Fire' in the same map

- **ID:** `unity/input-system-usage-conflict`
- **Domain:** unity
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 90%

## Root Cause

Two actions in the same Input Action Map share the same binding path, causing a conflict during runtime rebinding.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Unity 2022.3 | active | — | — |
| Unity 2023.1 | active | — | — |
| Input System 1.7.0 | active | — | — |

## Workarounds

1. **Open the Input Action Asset in the editor, select the 'Fire' action, and change its binding path to a different key (e.g., 'Mouse/leftButton'). Then rebind 'Jump' to 'Keyboard/space'. Alternatively, use composite bindings like '1D Axis' to share controls with modifiers.** (90% success)
   ```
   Open the Input Action Asset in the editor, select the 'Fire' action, and change its binding path to a different key (e.g., 'Mouse/leftButton'). Then rebind 'Jump' to 'Keyboard/space'. Alternatively, use composite bindings like '1D Axis' to share controls with modifiers.
   ```
2. **In code, before rebinding, check for conflicts using InputActionRebindingExtensions.GetBindingIndexForControl and manually unbind the conflicting action. Example: var rebind = action.ApplyBindingOverride(newBindingPath, conflicts: InputBinding.MaskByGroup("Keyboard"));** (85% success)
   ```
   In code, before rebinding, check for conflicts using InputActionRebindingExtensions.GetBindingIndexForControl and manually unbind the conflicting action. Example: var rebind = action.ApplyBindingOverride(newBindingPath, conflicts: InputBinding.MaskByGroup("Keyboard"));
   ```

## Dead Ends

- **** — Disabling the conflicting action does not free the binding; the conflict persists in the asset. (50% fail)
- **** — Deleting and recreating the action map from scratch may lose all bindings and is overkill. (30% fail)