UART init error

Hello,

I use Epruino Pico version 1.86.

The source code is made of this unique line of code:

Serial2.setup(9600, { rx: A3, tx : A2 });

Running it leads to this error :

echo(0);
Uncaught Error: Function "b" not found!
at line 1 col 9
Serial2.b(9600,{a:A3,c:A2});

    ^

=undefined

Same story with:
Serial2.setup(9600,{rx:A3, tx:A2,bytesize:8,parity:'even',stopbits:1});

I feel to be an idiot, since it seems so trivial to use...
Is this normal ?
Any advice is welcome.

Best regards

GeekBot