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

# OldKey

> Kotlin Data Class

**Data Class**

```kotlin theme={null}
data class OldKey(val message: String = "Old API key format detected. Please use the new key format.", val cause: Throwable? = null) : ApiKeyError
```

## Constructors

```kotlin theme={null}
constructor(message: String = "Old API key format detected. Please use the new key format.", cause: Throwable? = null)
```

## Properties

### cause

```kotlin theme={null}
open override val cause: Throwable? = null
```

### message

```kotlin theme={null}
open override val message: String
```