Please ensure the entered address is not empty.
Check the address using an online Blockchain Explorer (for example: blockchain.info for BTC or etherscan.io for ETH addresses).
Make sure you copied and entered the address correctly. No spaces, additions or missing digits.
Please note that hardware wallet devices are usually generating a new address for every transaction. In these cases we recommend using the xpub address for BTC transactions. You can find it on the Bitcoin Wallet Import page, in the second row. For Xpub addresses it is necessary to enter historical trades manually, or via a bulk import.