-snip-
Thank you, it works.
I add the RPC port to the
bitcoin.conf file
server=1
rpcuser=Husna QA
rpcpassword=
rpcport=8332
and changed the RPC URL on Electrum (
http://localhost:8332/)

-snip-
The first time I used the BWT plugin, the port was there automatically. I didn't know this was for Regtest.