Btnx not acknowledging mouse button

[hhradice]

I have been using btnx for quite some time but recently encountered a problem. I got a new mouse - Logitech M510 - and configured it in btnx. When I use it one of the buttons is not recognized. When I configured it all of the buttons were recognize. However when I start it I get the following

btnx -b -c Logitech1
btnx: Previous daemon already running. Killing it.
btnx: uinput modprobed successfully.
btnx: Opening config file: /etc/btnx/btnx_config_Logitech1
btnx: No configured mouse handler detected: No such file or directory
btnx: Opening config file: /etc/btnx/btnx_config_Logitech
btnx: No configured mouse handler detected: No such file or directory
btnx: Opening config file: /etc/btnx/btnx_config_
btnx: Could not read the config file: No such file or directory
btnx: Configuration file error.

The configuration files are there. Where do I get the mouse handler? Is one needed for Linux? I am running Fedora 32 64-bit.
The mouse has 2 buttons on the left side. I configure 1 to be Enter and the other to be ESC.