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# NFCPresentmentIntentAssertion.Error.systemNotAvailable

The system is unavailable because it’s in the cool-down period.

```
case systemNotAvailable
```

## Discussion

CoreNFC enforces a cool-down period after one [`NFCPresentmentIntentAssertion`](/documentation/CoreNFC/NFCPresentmentIntentAssertion) invalidates and before you can acquire another one. If you receive this error, wait a short time before trying to acquire a new [`NFCPresentmentIntentAssertion`](/documentation/CoreNFC/NFCPresentmentIntentAssertion).

---

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