Can transmit my first message to cubase

Hello, I can't seems to transmit my first message to cubase
here is my config




It seems the root widget is also attempting to send an invalid midi message, you should empty its target property to get rid of the error (red message in the launcher console). Then to check what's being sent by open stage control, enable the debug option in the launcher. Since you're using a custom module and a rather complex one I assume, you might get proper help from other users of this module.

I deleted the custom module for now for further testing
I no longer have an error

But MIDIOX doesn't detect any midi messages
Should I see a "oscbensmir" midi port in MIDIOX ?

The messages in the console seem to indicate that messages are sent back directly to open stage control after being sent so that'd be a config issue in loopmidi or in open stage control's midi configuration.

Should I see a "oscbensmir" midi port in MIDIOX ?

No, "oscbensmir" is a name that only makes sense within open stage control and that you can use as a midi target , here you connected it to input port n°7 and output port n°8, you need to check whether these port numbers are correct by listing the available ports (launcher menu > List MIDI Devices).
To avoid messing with port numbers (these may even change), the safest solution is to write

oscbensmidi:mcutoosc,mcufromosc

instead of

oscbensmidi:7,8

That's what this sentence in the docs is about:

If a string is specified, the first port whose name contains the string will be used (comparison is case-insensitive).

I wrote the exact names of the midi ports, and it works.
It's now transmitting to MIDIOX as intended.

But still not transmitting to Cubase

Updated : sorry it does transmit to cubase, I see the message in midi monitor
before I was checking at the bottom right corner for the blinking blue light, it wasn't there, so I concluded that the messages weren't coming