Test Token transfer issue

So, i just started using Matic for fast transaction speeds in my DApp. Im using matic-js to transfer tokens. So i deposited test tokens from Ropsten to Matic testnet. Then i transferred those tokens to another account. But if i try to transfer those tokens back to my 1st account, Im getting a error: "Invalid params: unknown field ‘chainId’ ". I cant seem to solve this problem and I understand that there is some approval issue. Please help.


Can you provide more details such as the transaction hash, etc. so that we can delve deeper?