# Frequently Occurring Issues

We often encounter the following issues, so we'd like to share the solution:

1. When gas fee appears as "0" or an extremely high value.
2. When a decline message appears.
3. When an RPC error occurs.

Solution: Delete the added network information below and set it up again as shown below.

```
- Network Name: Klaytn Mainnet
- New RPC URL: https://public-node-api.klaytnapi.com/v1/cypress
- Chain ID: 8217
- Currency Symbol: KLAY
```

{% hint style="warning" %}
When adding the network again, there may be cases where the Chain ID is not recognized. In such cases, you need to retry until it is recognized.
{% endhint %}

{% hint style="warning" %}
When sending another NFT after sending one, you also need to delete and add the network information again for a higher chance of success
{% endhint %}