I am running the most recent version of IE (0.12-91)

I have an MV capacitor with MV connector going to an MV relay via MV wire coil. when I try connecting MV wire coil to transformer on a pole from the MV relay an error message appears as per the screenshot. when using a transformer that's not on a pole it works as it should.

I'm new to the mod but I'm fairly confident it's not me that's broken! (hopefully)
Thanks for the help!