Unsolved error: cant add child to parent on port 2

I'm asking you to help me with a problem when creating a mod.
(I'm not good at English, so I write everything through a translator)

when I start the game, when I download the mod, an error occurs in the console.:
Can't add child ("driveshaft_F") to parent ("transfercase") on port 2, parent does not have a matching output port

please tell me what could be the cause of the error, if necessary, I can download the files from the mod.
I just started studying engines, so this error is unknown to me.

 

my transfercase_RWD is shaft, and transfercase_AWD is splitShaft, do I need to replace the shaft in transfercase_RWD with splitShaft?

 

could this error cause engine problems? for example, problems with overclocking the car, or with the transmission

 

what does "no CMU present, disabling system" mean?

 

I still can't fix the error "Can't add child ("driveshaft_F") to parent ("transfercase") on port 2, parent does not have a matching output port", I seem to have everything right with transfercase
I don't understand what's going on, can you help me please?

 

I took the code from etk800 and all I changed in this code was just the slottype and the name
awd is working, but it's like it's rattling and it leaves tire tracks on the asphalt, I think it's because of this error.
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Should I send the code?

 

ok, but how do I add it?

 

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no, the error still remains.
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although the awd seems to work correctly, but there is an error.

 

Okay, the error may be from another mod, since I've already uploaded the archive to you, I'd like to share the second error right away, I don't even know what it's related to.
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the thing with the car windows is, when I burn my mod first than the etk800, then everything is fine with the windows, but when I burn the etk800 and then my mod, then some kind of problem appears on the windows, I'll attach a video