If you see the error "Error - You currently have another ETH Transaction pending”, we are unable to process your ETH transaction, because you have another transaction pending from the same sub-wallet / address. The original transaction will to be in your inbox.
We block multiple pending transactions from the same address on Ethereum based networks to prevent higher chances of transactions being out of sequence which can cause a transactions to be dropped by the network. The Ethereum network enforces that all transactions are added in sequence.
There are 2 main options:
Wait and sign the original transaction in your inbox and ensure it is sent to the network.
Use the API to set the transaction nonce value which will bypass this check and allow you create lots of pending transactions. (This is only for more advanced users)
This will effect "Ethereum" and "XinFin" chains.