Can't make a new RFXMeter counter

[arnaudarduino]

Domoticz
Version: 4.10717
Build Hash: b38b49e5
Compile Date: 2019-05-09 13:04:08
dzVents Version: 2.4.19
Python Version: 3.4.2 (default, Oct 19 2014, 14:03:53) [GCC 4.9.1]

If have 3 RFXMeters working, for measuring S0 kwh meters ,but i need some more.
I can't get 1 more its not showing up.
Vb When i pick the puls from the 4 to 3 the switch shows it.
So how can i get some more rfxmeters (hardware dummy does nothing).
In which log will this failure show up.
I have the correct gpio and idx
Txs