To fix these errors please remove the token from your MyCrypto Interface and re-add the token. To remove a custom token, click the little ( - ) icon next to token you wish to re-add. This will remove it from the interface. It is not deleting or removing the tokens from your wallet, they are still safely in your wallet.
You may refer below link
https://support.mycrypto.com/tokens/adding-new-token-and-sending-custom-tokens.html