> ## Documentation Index
> Fetch the complete documentation index at: https://docs.thrindex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# E0107 — InvalidResetMode

> The LIF reset mode is not 'subtract' or 'zero'.

<Warning>E0107: invalid LIF reset mode</Warning>

## What happened

A LIF layer in the model has a `reset` value that is not one of the two valid modes: `"subtract"` or `"zero"`.

## Why

The canonical vocabulary (Playbook §28) defines exactly two reset modes:

* `"subtract"` — threshold is subtracted from the membrane potential after a spike
* `"zero"` — membrane potential is reset to zero unconditionally after a spike

Any other string is rejected.

## How to fix

Change the `reset` parameter to one of the valid values:

```python theme={null}
# Good
snn.LIF(tau_mem=20.0, threshold=0.3, reset="subtract")
snn.LIF(tau_mem=20.0, threshold=0.3, reset="zero")

# Bad (will produce E0107)
snn.LIF(tau_mem=20.0, threshold=0.3, reset="hard")
snn.LIF(tau_mem=20.0, threshold=0.3, reset="soft_reset")
```

## Example

```
E0107: invalid LIF reset mode "hard_reset" in layer 1
Why: reset must be "subtract" or "zero" (Playbook §28 canonical vocab).
Fix: change reset to "subtract" or "zero" when constructing the LIF layer.
Docs: https://docs.thrindex.com/errors/E0107
```