TyFlow Ext Map Channel is already registered

[alexp]

Having some issues with renders taking a very long time to get going.

Using VRAY GPU.

I have determined its down to this error message, but I have no idea what this means- see screenshot

This message repeats millions of times.

Interestingly though, this issue does not appear with Arnold or Redshift.

Hoping someone can shed some light on what this error means?

Thanks