---
title: "MTOfflineError.MissingKey | Mobile sdk | Mobile sdk android | Android"
description: "MissingKey"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# MTOfflineError.MissingKey

data class [MissingKey](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-missing-key/)(val key: [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)) : [MTOfflineError](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/)

A required key is missing in style.json or TileJSON.

Members

## Constructors

[MissingKey](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-missing-key/-missing-key/)

constructor(key: [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html))

## Properties

[cause](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-invalid-pack/#-654012527%2FProperties%2F1466267346)

open val [cause](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-invalid-pack/#-654012527%2FProperties%2F1466267346): [Throwable](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-throwable/index.html)?

[key](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-missing-key/key/)

val [key](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-missing-key/key/): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)

[message](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-missing-key/message/)

open override val [message](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.offline/-m-t-offline-error/-missing-key/message/): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)