This a limitation/bug in FastRoute; I have actually fixed it locally but didn't have the time yet to clean up and do PR it at OpenROAD. Hopefully today...

[ERROR] Net trans_I.mc_opcode\[14\] has invalid sinks/source distribution

It's expecting nets to have a single source driver (which is fair, but there are exceptions in several designs), so if you check which net it's complaining about against the LEF file of the macro, you will find that some of the pins either have either a wrong direction (

DIRECTION INPUT|OUTPUT|INOUT

) or none. You could also run it interactively (either manual or scripted with

-file

) and remove the offending NET right before routing if you'd like to hack it around.