Are you seeing this error message, while your transaction is still showing as pending on the 1inch site? If so, then your transaction has not yet broadcasted to the blockchain. After waiting a while, you can remove it from the transaction history on both the 1inch user interface (UI) and within the wallet itself.
To remove pending transactions from the 1inch desktop UI:
Click on the "Pending" button in the top-right corner of the page.
2. Click "Transaction History"
3. Click "Remove Pending Txs"
In addition to removing a stalled transaction from the 1inch interface, you might also need to remove it from your wallet as well. Depending on which wallet you are using, the method to accomplish this will vary substantially.
Here are links to removal/reset directions for the several commonly used wallets:
***PLEASE BACK UP YOUR PRIVATE KEY / RECOVERY PHRASE BEFORE RESETTING THESE WALLETS: