Errors/Chain errors
ExistentialDeposit
Leave enough free TAO for the existential deposit, or use a full-balance transfer that allows reaping; check with `btcli wallet balance`
The amount is too small to create the destination account: its resulting balance would sit below the existential deposit. Compare the transfer value plus the destination's current free balance against the ExistentialDeposit constant.
Declared by the Balances pallet; it classifies to the semantic code insufficient_balance.
Remediation
Leave enough free TAO for the existential deposit, or use a full-balance transfer that allows reaping; check with btcli wallet balance
The same explanation is available in the terminal: btcli explain ExistentialDeposit.