# Troubleshooting

<details>

<summary>Error: Please Add The Network You Want To Transact In </summary>

<img src="https://2862319636-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1YRoR7fazGxiQsx9pH6m%2Fuploads%2FRyLRCSOE8rPSovfB2rdK%2FError%20-%20Add%20the%20Network%20-%20to%20Transact%20in.png?alt=media&#x26;token=2e85ca9b-118c-49b3-a940-8811f547f21e" alt="" data-size="original">

You will receive this error when you have not added the chain specs for the network on which you are trying to transact. Follow [these instructions](https://docs.novawallet.io/nova-wallet-wiki/wallet-management/hardware-wallets/polkadot-vault-legacy/update-chain-metadata-in-polkadot-vault) on how to add chain specs and metadata.

</details>

<details>

<summary>Error: Please Download Network Metadata</summary>

![](https://2862319636-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1YRoR7fazGxiQsx9pH6m%2Fuploads%2F6spNYUJThmQ9vxiTyvug%2FError%20-%20Download%20Network%20Metadata.png?alt=media\&token=34f46390-2ac0-439b-825e-5dd0c2e751bb)

You will receive this error when you have not added/updated the metadata for a network to which you have previously added the chain spec. This issue is usually caused due to a recent runtime upgrade on the chain you are trying to transact on.

Follow[ these instructions](https://docs.novawallet.io/nova-wallet-wiki/wallet-management/hardware-wallets/polkadot-vault-legacy/update-chain-metadata-in-polkadot-vault) on how to update a chain's metadata.

</details>

<details>

<summary>Error: Transaction author public key not found.</summary>

<img src="https://2862319636-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1YRoR7fazGxiQsx9pH6m%2Fuploads%2FocoAgdtMW3zCjJ9nQJDv%2FError%20-%20Author%20Public%20Key%20Not%20Found.png?alt=media&#x26;token=9f938d0b-c336-4510-a1c0-cf2cc4b9cd97" alt="" data-size="original">

This error occurs when your Polkadot Vault doesn’t have a public key associated with the network you’re operating with.

To solve this:

1. `Open` the **Key Set** you’re operating with on the <mark style="background-color:purple;">Polkadot Vault Device</mark>.
2. `Tap` to **+** at the top right corner of the screen.
3. `Select` the **net**work you’re operating with.
4. Enter the **derivation path** or make it empty if you don’t use derivation.
5. `Tap` **Done**.
6. `Confirm` that you’ve written down the derivation path and **continue.**

</details>

## Still have any issues with Polkadot Vault?

Please let us know by contacting us via email at <support@novawallet.io> and sending the following information:

1. Issue description — what happened?
2. Polkadot Vault information: device platform (iOS/Android), app version and the issue on <mark style="background-color:purple;">Polkadot Vault Device</mark> (if any)
3. Nova Wallet information: device platform (iOS/Android), app version and the issue on <mark style="background-color:blue;">Nova Wallet Device</mark> (if any)

{% hint style="danger" %}

#### Never share your mnemonic passphrase (12 words) and/or other representation of your private keys! Admins/team members will never request it from you. Store your mnemonic passphrase/keys and any backups securely and privately.

{% endhint %}