Troubleshooting

Here are solutions to some of the common problems you may come across:

Unexpected Epoch Change

There is a known issue with the Substrate block production (BABE) on a running chain. If you stop your node for too long (closing the terminal, putting your computer to sleep, etc.), you will get the following error:

ClientImport("Unexpected epoch change")

To solve this you will need to restart your node with: substrate-contracts-node. At that point, you will need to re-deploy any contracts and re-do any steps that you may have done before on your node. As long as you keep your node running, you should face no issues.

Old Contracts in Local Storage

Contracts UI uses its own local storage to track the contracts that you have deployed. This means that if you deploy a contract using the UI, and then purge your Substrate node, you will be prompted to reset your local storage and please do so. And then re-deploy any contracts and re-do any steps that you may have done before on your node.

Other Issues

If you run into any other issues during this tutorial, please report an issue!