I had this error after switching to live test nets then back to local host. The error originates from these line of code in your react components.
const greeterAddress = "{address that you copied in from the local node instance}"
const tokenAddress = "{address that you copied in from the local node instance}"
If you're deploying on Ropsten for example, you will need to manually update this line of code, changing the address to the deployed address that hardhat will supply in the terminal after successfully deploying. So when switching from local to test net, this line needs to be changed!
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I had this error after switching to live test nets then back to local host. The error originates from these line of code in your react components.
const greeterAddress = "{address that you copied in from the local node instance}"
const tokenAddress = "{address that you copied in from the local node instance}"
If you're deploying on Ropsten for example, you will need to manually update this line of code, changing the address to the deployed address that hardhat will supply in the terminal after successfully deploying. So when switching from local to test net, this line needs to be changed!