Hi All,

in the help you can see:

 -paytxfee=<amt>        Fee (in BTC/kB) to add to transactions you send (default: 0.00)

But, when I am trying to set the tx fee to 0 in the regtest mode, as in each transaction there is an amount subtracted from the balance, I receive the following error:

root@alice:/# bitcoin-cli -regtest -paytxfee=0.00 -sendfreetransactions -daemon -printtoconsole                                                                             
Bitcoin server starting
root@alice:/# Error: Invalid amount for -paytxfee=<amount>: '0.00' (must be at least 0.00001000 BTC/kB)
Error: Invalid amount for -paytxfee=<amount>: '0.00' (must be at least 0.00001000 BTC/kB)
Shutdown: In progress...
StopNode()
Shutdown: done

Why?